Frictional Forces are Surface dependant Essay Example

Frictional Forces are Surface dependant Essay We were given a coursework question asking us to prove that Frictional Forces are Surface dependant. We were asked to prove this. I have therefore thought of several ways to do so; I thought of throwing different objects across different surfaces. I thought of using an elastic band to throw a block of wood, 4.5cm X 4.5cm x 4.5cm, across a certain surface with a certain length; 1.25 metres. I thought of making the surface as my independent variable and the block of wood as my dependant variable. I also thought of performing the above procedure but instead of using different types of surfaces, I thought I would use several types of blocks of different material, but all of the same weight. And using the rubber band, throw it across a surface of ceramic. We will write a custom essay sample on Frictional Forces are Surface dependant specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Frictional Forces are Surface dependant specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Frictional Forces are Surface dependant specifically for you FOR ONLY $16.38 $13.9/page Hire Writer I have decided to merge the two ideas, and came up with the following idea and procedure; My idea was that I could use two 5cm x 5cm x 5cm blocks, one of wood, and the second of plastic foam. I intend to try them on several different types of surface; wood, ceramic, marble, carpet (with a certain thickness which I shall state later on), and glass. All of which are 1.00metres (100cm) in length. I intend to use the surfaces as my independent variables, and the blocks as my dependant variables. I intend to prove that the type of surface, makes a lot of difference in the velocity (speed) of the block, and that due to friction and the surface, the distance covered, and the time consumed change according to the type of surface, and whether it has a high frictional surface or a low frictional surface? My procedure: I thought that I would implement my idea so as to prove the relationship between the contact surface, and the frictional force. Firstly, I would like to refer to the information that I have gathered so as to enable me to place a procedure that is correct and which I guarantee that it will provide me with some reliable results. Friction is the property that objects have which makes them resist being moved across one another. If two objects are placed one on top of the other, the top object can be lifted without any resistance except that of gravity. But if one object is pushed or pulled along the surface of the other, there is a resistance caused by friction. Friction has many important uses; it makes the wheels of a locomotive grip the rails of the track. It allows a conveyor belt to turn on the pulleys without slipping. Without friction, we would not have been able to walk on the pavement; we would have kept on slipping! Thats why it is hard to walk on ice; it produces friction that is less than the pavement, and therefore causes us our shoes to slip. Friction also has disadvantages; it produces heat which causes objects to wear; have you ever looked at the soles of shoes which you have been wearing for 2 years, and the soles of brand new shoes? Observe the difference! Several layers of your shoes soles have worn away due to the friction of the shoes on the pavement, this is why lubricating oils are used to fill in the gaps between moving machinery parts. There are three main kinds of friction: Sliding or kinetic friction; this is produced when two surfaces slide across each other, like when a book moves across a table. There is also rolling friction, which is the resistance produced when a rolling body moves over a surface. E.g.: the friction between a car tyre and the street is rolling friction. Fluid Friction/ Viscosity are the third type of friction. It is the friction between moving fluids or between a fluid and a solid. Thinner fluids have less viscosity than thicker fluids, and usually flow faster. E.G: erosion of rocks in the rivers by running water. The law of friction: The basic law of friction states that the force needed to overcome friction is proportional to the total perpendicular force pressing one surface against the other. E.g.: when the weight of a box being pulled across the floor is doubled, the force pulling the box must be doubled. The ratio between the weight being pulled/pushed, and the force required is called the coefficient of friction. The value of the C.F depends on the type of surfaces moving against each other. Friction: Friction is the resistance that a moving object meets when it is in contact with another object. It is a force that converts a moving objects kinetic energy (energy of motion) into other forms of energy, such as heat and sound. This process slows the object down. Friction can be reduced for example, by lubricating the surfaces of the two objects in contact. Friction can be useful, too. It is the force that makes a cars brakes work. E.G.: When a match is struck, friction provides the heat that causes phosphorus in the match head to ignite. Coefficient of Friction: The coefficient of static friction is a measure of how much force must be applied to an object to overcome friction and set it moving across the surface of another object. It varies for different pairs of objects. The coefficient of kinetic friction describes how much force must be applied to overcome friction between the two objects once one of them is in motion. Theory Suppose you place a book on a rough desktop. The weight of the book produces an equal and opposite reaction force; R from the surface. The force you need to apply to make the book begin to slide is independent of its area of contact with the surface but is proportional to R. The force you need to apply is related to the weight of the book (equal to R) by the coefficient of static friction, symbol ?. If you try to push the book sideways with a force that is less than ?R, it is cancelled out by a corresponding frictional force, and the book does not move. As you increase the force, the frictional force increases too. The frictional force will continue to increase as a reaction to you pushing the book until it reaches ?R, which is the limit of static friction. If you increase the force beyond this limit, the book starts to move across the surface. The value of the coefficient ? is determined by the two adjacent surfaces and is not a strict constant. Its value varies from about 0.15 to 0.6 for most dry and fairly smooth surfaces. It depends only on the nature of the two bodies, and not (as might be supposed) on the area of contact between them. In other words, if you have two equally heavy books made from an identical material, you need to push just as hard to make them move, even if one book is large and thin (has a large cover) and the other is small and fat (has a small cover). Once an object is moving steadily across a surface, its movement is opposed by a kinetic friction force. This force has a value lower than the limiting force of static friction, meaning that a greater force is needed to start an object than to keep it moving. This is described by a coefficient of kinetic friction, which is always less than the coefficient of static friction for two objects. Formula Force needed to overcome friction (Fmax) = coefficient of static friction (?) à ¯Ã‚ ¿Ã‚ ½ force keeping body at rest (R). Since both forces are measured in Newton (N), the coefficient of static friction is simply a number with no units. Example A car of mass 1,000?kg has broken down on a road made of asphalt. If the driver has lost the keys and the brakes are locked on, what force is needed to push the car? The coefficient of static friction between rubber and asphalt is 0.60, and the acceleration due to gravity, g, can be taken to be 10?m?s?2. Solution The car resists any attempt to move it due to its weight, which is equal to its mass multiplied by the gravitational acceleration g. R = m à ¯Ã‚ ¿Ã‚ ½ g = 1,000 à ¯Ã‚ ¿Ã‚ ½ 10 = 10,000?N Fmax?=à ¯Ã‚ ¿Ã‚ ½?R Fmax?=?0.60?à ¯Ã‚ ¿Ã‚ ½?10,000?N = 6,000?N A force of 6,000?newtons (N) is needed to push the car. Therefore, with reference to the information stated above, I have planned the following procedure and equipment: Apparatus: * 1 Block of wood with measurements 4.5cm X 4.5cm X 4.5cm (volume= 4.5cm3). (dependant Variable) * 1 Block of plastic foam, 4.5cm X 4.5cm X 4.5cm (volume = 4.5cm3). (dependant Variable) * 1.00metres of: ceramic, carpet (2mm thickness), carpet (7mm thickness), marble, wood, and glass. (independent Variables) * Stopwatch. * Tape-measure. * Elastic band (which reaches a length of 85cm when stretched). * Cello-tape. * Scissors. * A marker pen. * An electronic weighing scale. Procedure: 1. I will measure the sides of the cube to ensure that it is exactly 5cm3. 2. I will then measure 100 cm of each surface, and stick the cello-tape across the length of each. 3. Using the marker pen, I will place a mark on the tape every 10cms. 4. Next, I will measure a distance of 5cm (equal to the size of the cube) from one end of the surface, and also on the side opposite to it; 5cms extra to the 100 of the surface, 15 extra on the right hand sides, and 5cm extra on the left hand side. This is the space I will place the cube in before catapulting it across the surface. 5. I will then measure the width of the tape, and stick the exact amount of the rubber band underneath it, one side of the rubber band at a distance of 10cms apart. 6. Then, using the rubber band that has been stuck to the surface, I will place the wooden block in between the rubber band, and pull the rubber band back (with the cube) to a distance of 15cm. (the 15cm I have added previously). 7. I will hold the stop watch in one hand, while holding the stretched rubber band and the wooden block in the other hand. As soon as I let go of the rubber band, I will start the stopwatch. 8. I will observe the block fly across the surface, and I will have my finger on the stop button in the watch, and thats to stop it once the block reaches the end of the surface, or if it stops in the middle of the surface. In which case I will take a reading of the distance covered and not down the time in my table. 9. I will repeat this experiment 3 times, and thats to guarantee the reliability of my results, and also to graph the average of my results which should be more accurate than just one trial. 10. I shall repeat the above procedure for the different types of surfaces and for the different cubes. * I intend to take some safety measures; I will place an extra piece of tape on top of the tape already holding the rubber-band in place, and that is to ensure that it will not fling out of place. I also intend to place two 1metre rulers on either side of the practical area, and thats to prevent the block of wood from flying off course. I also have several other rubber bands of the same thickness and length of the rubber band being used (from the same box), and thats in case the rubber band used breaks. I have also placed a piece of tape on the surface; marking the end of the 100 cm, and that is to enable me to see exactly when the block has passed the 100 cm, enabling me to stop the stop-watch in the right time, resulting in some reliable results. My theory: I believe that my plan shall be quite good and that it shall enable me to obtain sufficient results which are reliable. My theory is that the rougher the surface, the higher the friction, and consequently, the more time is consumed for the block to reach the markers. While the smoother the surface, the less the friction, and consequently, the less time is consumed. My Prediction: I predict that the marble shall prove a very good surface close to ice which will enable the block to shoot across it like a bullet fired from a gun, this is because the marble surface is quite smooth, and also quite slippery, which indicates a low level of frequency. Yet, I predict that the 7mm thick carpet and the wooden surface shall prove to have very high friction, and thus, the block shall not be able to cover the complete distance of 1.00metres on that surface, especially with the force applied. This is of course with reference to the data stated above. I have placed this plan according to a test we have previously observed regarding friction, as we have studied in class friction and its effect. This gave me the idea that I need an equal amount of force to push the block each time; and if I was to apply this force by hand, how could I guarantee that the force applied each time is equal? The test has to be fair! So I decided to follow the above procedure, using a rubber band which is stretched to a certain extent (15cm), this will guarantee that the force applied each time is equal. I have also thought of extending the length of the surfaces used to 2.0 meters, but after my preliminary test, I found that 1.00 metres are sufficient, and that they will enable me to prove my theory and prediction. I have modified my original version which I have followed in my preliminary test, and thats to guarantee the reliability of my results. MY PRELIMINARY TEST: I should have placed this test earlier, but I was unlucky enough to be unable to find a good place for it, so I thought that the best place for it would be here; at the end of my planning, and that is to link it with my observations and Obtaining. For my preliminary testing, I decided to try out a procedure which would enable me to obtain some reliable results; after deciding upon the investigation I intended to perform, I decided to use a rubber band to apply equivalent forces each time in my original investigation. I also decided to try out my preliminary using a block of wood with a volume of 4.5cm3. I decided to try my preliminary on ceramic as it was the easiest to start with; so I placed two 1 metre rulers at a distance of 10cm apart. I placed them both with their 0 ends towards my side, and the 100cm marker at the other end. I then stuck the two ends of the rubber band (25cm in length) one side at either ruler. I placed a piece of tape at the end of the surface, linking the two 100cm marks together and showing me the end of the 1 metre distance. I then measured out 15 cm from the 0cm markings, and placed a piece of tape in between the two rulers. I then placed a block of wood with volume 5cm3 in between the two arms of the rubber band, and pulled it with the rubber band to the extent of 15cm (until the marking), I then let them go, and the block of wood was catapulted towards the other end (towards the 1metre marking). I took a record of the time consumed, and found that it covered 60 cm and stopped. That took it a time of 0:32 sec. Therefore, according to this preliminary, I have decided upon using a distance of 1.0 metres; since the smoothest surface with the least friction (in my opinion) did not allow the block of wood to cover more than 60cm, I do not expect any of the other surfaces to provide a force which will be less than the force applied by the rubber-band. I have therefore drawn up the procedure stated above; this is because I believe it to be the best procedure I could follow, and implement the steps within. That is of course with reference to the safety measures I have taken, and also because I am familiar with most of the equipment, and could therefore tackle their side effects. I also hope that this procedure will enable me to gain the best results possible. The source of my idea: We have previously performed a semi-coursework which consisted of the following: we were required to prove that an object accelerates as it descends and gets closer to the ground due to the gravitational pull upon it. To do this, we were given a measuring cylinder full of 1liter of motor oil. We placed 10 markers which were equidistant (5cm3). We then dropped 10 ball bearings; one at a time. Each time, we started the stop watch as the ball started to descend, and stopped the watch at the next marker each time. E.g.: the first ball, the stop watch was stopped at the first marker. The second ball at the second marker, the third at the third markeretc. we then obtained the ball bearings by the aid of a powerful magnet, and repeated the investigation. We then averaged the time and graphed our results. Before performing the original investigation, I decided to perform a preliminary test which I have stated the results and consequences of previously. I then intended to perform the investigation, implementing the procedure I have drawn up for myself. I then found out that this procedure would not provide me with a fair test. So I decided to alter my plan slightly; instead of timing how long it took for the block to stop, I could count how long it took for the block to pass each marker (10cm). I would therefore have to decrease the amount of surfaces I intend to use to two (2). This is because I intend to make it a fair test, and also; to save me some time. Therefore, I will catapult the block 10 times, note down the time it took to reach each marker in turn. I started off by getting the tools and materials required and placing them in a small, neat pile on my work bench. In doing so, I found that the surfaces were not portable (mobile), and I would therefore have to go to each surface wherever it is. First of all, I started by cutting up 230cm of Cello-tape (aided by the 1meter ruler) and then splitting that into two equal pieces (strips); each strip with a length of 115cm. using the marker pen, I placed a mark on the tape every 10cm, (the 0 mark starts after 15cm); I intend to use only two surfaces; ceramic ; wood. This is to spare me some time to perform repeats and to compare the results using the two blocks. I will perform the experiment with the two blocks as stated in my primary plan. All that has changed is the method of recording time; instead of recording the time each block took to completely stop on each surface, I will measure the time taken for it each time to cover the distance between the markers; e.g.: in the first catapult, I shall stop the watch when the block passes the first marker indicating (10cm). In the second catapult, I will stop the watch when the block passes the 2nd marker, indicating 20cm, and so on, similar to my source of idea and procedure. I also found that the process was too time consuming, and I therefore decided to perform the investigation with only one block, the block of wood. After marking every 10cm on the tape, I decided to start with the ceramic surface, so I went to the ceramic surface and placed one of the two strips of tape along the length of one side of it. I then measured a distance of 20cm from the tape, and stuck down the second strip of tape; the two tapes are parallel with a distance of 10cm in between them. I then cut the rubber band from one side, which gave me a long strip of rubber. At the 0cm mark, I stuck one arm of the rubber; I then stuck the other arm at the opposite 0cm mark (one arm at each tape). I then placed the wooden block in the rubber bands Lap; between the two arms, and pulled them (the rubber band and the block). As soon as I let go, I pressed the start button on the watch. I then stopped the watch once the block had passed the 1st mark. I then repeated the procedure, but this time stopped the stop-watch as soon as the block passed the second marker. I kept on doing this, each time stopping the stopwatch at the next marker . After finishing doing so, I did my repeats, repeating this process all over again 3 times until I had got three readings for each marker. I then repeated the whole process, but this time, I did it with the wooden surface; I took the marked tape I had used in the previous experiment, did my measurements, and stuck everything down as I had done in the previous surface; marble. I then repeated the process as I have done in the previous surfaces. I have included below a table containing my results, and a full report regarding what actually happened: Surface: Marble WOOD Dist. Time 1 Time 2 Time 3 Average Time v =s/t Time 1 Time 2 Time 3 Average Time v =s/t (Sec.) (Sec.) (Sec.) (Sec.) V (Sec.) (Sec.) (Sec.) (Sec.) V 10 0.2 0.21 0.19 0.2 50 0.2 0.24 0.22 0.22 45 20 0.29 0.28 0.31 0.29 69 0.34 0.35 0.29 0.32 63 30 0.4 0.42 0.39 0.4 75 0.38 0.41 0.4 0.396 76 40 0.51 0.5 0.53 0.52 77 0.49 0.51 0.52 0.51 78.4 50 0.72 0.68 0.71 0.7 71 0.72 0.65 0.68 0.68 73.5 60 0.85 0.88 0.91 0.88 68 0.86 0.89 0.91 0.89 67.4 70 0.96 1.05 1.1 1.04 65 STOPPED STOPPED STOPPED STOPPED STOPPED 80 STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED 90 STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED 100 STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED STOPPED After observing the results I have obtained and placed in the above table, and with reference to my notes and annotations which I have produced during the investigation, I found that the block of wood, would only reach a certain distance, that is of course due to the thrust (force applied), but as I have followed my initial plan step by step, altering only what I have stated previously, I could not alter anything else or make any extra modifications. I was therefore stuck with the rubber band I had started with. As is noticeable; in the first table which is for the marble, the block stopped at the marker indicating 70cm, and did not proceed. While in the second table which is for the wooden surface, the block reached the mark which indicated 60cm, and did not proceed. This I shall analyse in the following section and state the reasons for. Unfortunately, this investigation was not easy; this is mainly because not every time I let go of the rubber band did the block reach the required mark, and before stating that the block stopped, I did and re-did the experiment to ensure that the block could not indeed reach that level (mark). Sometimes I would also let go of the rubber band before starting the stop-watch. I have therefore tried my best to obtain and use the most reliable results possible. I have followed my procedure step by step, and I have also used the equipment I am most familiar with, and thats to enable me to cope with and provide the best results attainable by the aid of this equipment. I hope that these results are sufficient, and that they will enable me to prove my theory and prediction. After performing my investigational experiments, and identifying the most obvious of the information and mistakes, I intend to proceed to analyzing my results, procedure and implementation of it. Below are the graphs that I have drawn up based upon the average times, and the markings. By analysing the above graph which is the graph for the Marble surface; we can notice at a glance that there is what resembles a straight line. With reference to my physics knowledge, I know that a straight line starting from the 0, and extending at an angle of approximately 46o, indicates uniform acceleration. We also know that a line graph which starts somewhere along the Y-axis, and extends diagonally towards the X-axis resembles uniform retardation. Looking at this graph, it resembles uniform acceleration, but as it is not a V-t graph, it actually resembles uniform retardation. We gather this logically because more time is consumed by the cube, and thats for it to reach the following point. If we look at it scientifically; we could observe that the Y-axis is a time scale, and the higher up we go the more time is consumed 9on the graph), and the X-axis resembles the checkpoints or marker-points , and as we go further eastwards, we cover a greater distance, and by covering greater di stances, force wears away, and as we have started with a pushing force that unbalanced the opposing force, as the force wears off; is consumed, the forces start to balance, until the force completely wears off, and the opposing force has little resistance and is greater than the pushing force, which causes it (the block of wood) to eventually stop, leading it to a state of uniform velocity where acceleration equals Zero. This therefore causes the time consumed to increase. This is because though the acceleration has stopped and returned to a uniform state in which it equals Zero; time is still ticking away, and consequently, more time is consumed! I then studied the above graph for some time, and found that it was exactly the same as the first one. It resembles the trend of uniform acceleration in a V-T graph, but since these graphs are not V-T, and are Distance X time, the observation is different. The graph resembles a straight line, curving towards the end which indicates that the block is slowing down. This proves my theory, yet it also shows us that the speed /acceleration of the block are decreasing, which means that the opposing force seems to balance the pushing force, eventually overpowering it, causing it to slow down until it eventually stops, reaching a state of uniform velocity which is equal to zero. After analyzing the results, I found that there was a slight stability in the results obtained in the repeats. I have also noticed that the recorded times for the blocks passage by each marker or checkpoint each time. There seems to be a pattern in the graph as the results when linked with each other, provide a straight line which is quite rare to obtain. Closer analysis showed that the first graph which was for the blocks sliding across a marble surface had a line which was straight all the way to the end, while the second graph which was for the sliding of the wooden block along a wooden surface starts off straight, but towards the end, curves upwards slightly. This incline indicates a sudden change in the balancing of the forces. And since the incline is upwards, this suggests that the pushing force has been out-powered by the opposing force. I believe the situation to be so because the upwards incline suggests the increase in time consumption, which indicates that the pushing force which started off quite powerful and slightly stronger than the opposing force, enabling it to reach this point. But the force has been worn off in the long journey, and eventually, the acceleration of the block starts to decrease which indicates retardation. This retardation results in a weakening of force, which causes the pushing force to weaken, con sequently, it is over-powered by the resisting/opposing force. This proves my theory as I have theoretically stated that: The rougher the surface, the higher the friction, and consequently, the more time is consumed for the block to reach the markers. While the smoother the surface, the less the friction, and consequently, the less time is consumed. With reference to my results, we can see that on the marble surface, the block of wood reached the 70cm marker, that is, with the force that was applied. While the block of wood did not exceed the 60cmmarker on the wooden surface. This suggests that there was a greater opposing force provided by the wooden surface than that which was provided by the Marble surface. Closer studying to the surface enabled me to gather that the marble surface was indeed slightly smoother than the wooden surface. Scientifically, I would say this because the marble is one smooth surface, but the wood consists of fibres (I saw this using a magnifying glass), which cause the block to, slow down. I also thought of looking at the base of the block (I have been catapulting it on the same side), I found it was slightly darker than the other faces (of the cube) and that there were some splinters of wood sticking out of it which were not there when I started. This shows that there was indeed friction and that there certainly was some heat produced. Also, the block was made of the same kind of wood as that of the surface, which could be the cause of the great friction. Its like when we push our two hands upon each other, and try to slide one of them, its quite hard! You will eventually succeed, but by that time, you will have exerted a lot of energy, and anyway, you are applying more force every second by your muscles, and thats to complete the task. But place your two hands the same two hands!) On an icy surface; they will slide pretty easily, and you will probably find a hard time trying to stop them. This is exactly the case, the wooden block is pulled tightly towards the wooden surface by gravity, and as the two surfaces are from the same material, they will stop after a short time. This is because they are of the same material, they are pulled close together by gravity, and the force applied is not renewed. While when we placed the block of wood on the marble surface, we succeeded in making it reach a farther marker than on the wood. This is mainly because the marble surface is quite smooth, (it resembles ice in a way), and has no fragments sticking out f it (splinters), this makes a pretty slippery surface for the block of wood. I have stated previously that gravity plays an important role in this investigation; I have stated that the pull of gravity on the surface and block, cause them to stick close to each other, which plays an important role as this increases the friction, and consequently affects the terminal velocity (speed) of the block. We also know that the mass (size/weight) of the block determines the size of the gravitational pull on the block. We also know that acceleration = Force X Mass. I have therefore decided to weigh the block using an automatic scale, and found that it weighed: 50grams. I have also referred to the following Formula: F1F2 Then movement is present in the direction of F1. F1=F2, Then there is no motion/movement. In this formula, F1 indicates the force applied, the pushing force, while F2 indicates the opposing force. The above graphs are both for the velocity of the block of wood on both of the surfaces. To find the velocity, I had to refer to a formula which linked the speed with the distance and the time; Velocity = Distance / time. With reference to this formula, I managed to calculate the velocity of the block of wood on each of the surfaces. By observing the first graph, which is for the marble surface, we notice that the curve is slightly off-line, which indicates a problem with the investigation. But overall, it represents a curved line which starts at a low speed, and gradually the velocity increases, reaching its maximum as 78cm at the 4th marker (40). It then starts to slow down, but gradually. Unfortunately, I could not apply any greater pushing force on the cube so as to gain more results by it reaching the 100cm marker, because it would then have been an unfair test. We therefore notice that the graph (line) does not extend to the Zero line, which it should have done theoretically. We then observe the second (or in this case the 4th) graph, which is for the velocity of the wooden block on the wooden surface. We notice that the line (curve) is somewhat smoother than the other. If we looked at it more closely, we notice that the left side of the curve is a straight line directly from the zero, (indicated by red dotted line). The line reaches its maximum at 80cm at the 4th marker (40). This means that both the surfaces do not have any dramatic effect upon the block of wood until the 4th marker. This is of course with the exception of the maximum velocity of both surfaces which depends upon the material itself. Looking past the 4th marker, we notice that the 1st graph (3rd) starts to go off-line slightly which could be an anomaly, or could be due to one of the problems I intend to identify in my evaluation. But then, the line goes off at a straight line at an angle of approximately 195o. That is of course with reference to the theory that the line shall stay straight until it reaches the 0 line, which indicates a non-velocity state. This means that the line would probably have had to reach a 200 marker. But of course, there seems to be an anomaly as the line is not 100%straight. On the 2nd graph (4th), we notice that the line, after the 4th marker, seems to incline downwards, towards the 0 line on the X-axis, though, it is slightly steeper than the first graph, as it seems to be inclining at an angle of approx. 200o. This indicates that the marble surface is a less frictional surface in comparison with the wooden surface. I have gathered this because the line of the wooden block after the 4th marker is steeper than the line for the marble surface which is after the 4th marker. This mean that if we were to observe the graphs theoretically, we would find that the line for the marble surface would cover a greater distance, approx. 200cm (2.00m), while the steepness of the line for the wooden surface indicates that it would touch the zero line (X-axis) sooner than the line for the marble surface, I believe that the line for the wooden block will cover approx. a distance of 150cm (1.5m). With reference to the above information, I gather that the wooden block shall cover a greater distance on the marble surface than on the wooden surface, provided that the force applied is sufficient enough to enable the block of wood to cover the distance assigned. This is of course due to the high friction of the wooden surface which exceeds the frictional force of thee marble surface noticeably. With respect to the above statements, there is one contradiction; the maximum speed covered by the block on the wooden surface exceeds the maximum speed covered by the same block on the marble surface. That is by several centimetres (the unit of measuring velocity in this assignment). I have tried to find a scientific explanation for this phenomenon which outlaws any of the conclusions I have reached, but I was unsuccessful. We therefore conclude that the block of wood moved more smoothly on the marble surface. This proves my theory which stated that; the rougher the surface, the higher the friction, and consequently, the more time is consumed for the block to reach the markers. While the smoother the surface, the less the friction, and consequently, the less time is consumed. I therefore gathered that the Rougher the surface, the more the opposing force, and consequently, the more friction and heat are produced. Yet, the smoother the surface, the less the opposing force, and the less the friction and heat resulted. This also proves my prediction which was based on the information I had gathered previously and which stated: I predict that the marble shall prove a very good surface close to ice which will enable the block to shoot across it like a bullet fired from a gun, this is because the marble surface is quite smooth, and also quite slippery, which indicates a low level of frequency. Yet, I predict t hat the 7mm thick carpet and the wooden surface shall prove to have very high friction, and thus, the block shall not be able to cover the complete distance of 1.00metres on that surface, especially with the force applied. This is of course with reference to the data stated above. We also gather that friction is the property that objects have which makes them resist being moved across one another. If two objects are placed one on top of the other, the top object can be lifted without any resistance except that of gravity. But if one object is pushed or pulled along the surface of the other, there is a resistance caused by friction. With reference to the information I have gathered; the value of the C.F depends on The type of surfaces moving against each other. This relates to what I have stated previously regarding the type of surface, and for which I have provided an example using the hands. I have concluded the above after referring to detailed scientific information and also after closely analysing the results and evidence I have obtained. I therefore believe that I have done what was asked of me and that I have performed the task I was assigned and have succeeded in proving my theory, prediction and procedure to be accurate, correct, and reliable. Also by referring to the second graph which is for the wooden surface; we notice that the straight line curves towards the end (upwards), which suggests a sudden change in the balancing of the pushing and the opposing forces. Scientifically, this suggests retardation, and the curve indicates that the block suddenly started to lose the force applied to it. It started off with uniform retardation, and then suddenly started to stop several seconds faster than when it had started. This means that the wooden surface is slightly rougher than the marble surface, and that it provides friction that is slightly more (higher) than that provided by the marble surface. I believe that this is what I was asked to prove. Below is a diagram showing the forces available in this investigation: I have performed this investigation to a good standard, and believe that the results I have obtained are good enough and are sufficient as they have enabled me to prove my theory, prediction and procedure. They have also enabled me to prove what was asked of me. I wish to annotate the procedure I have followed because though I have performed it to a good standard, there are still some flaws in it and I still believe that it could be performed at a standard that would be better, well, no body is perfect. After finishing my investigations, I found that the block was slightly darker than when I started, this indicates that the surface may well not have been clean. This indicates that there were dust particles available on the surface, and as dust particles are sharp (when observed under the microscope) and have rough edges, it is therefore believed that they would cause a big difference in my results as their rough surfaces interfere with my investigation. I believe this because as the wood block is sliding across the surface, I am investigating the effect that the surface itself has on the terminal velocity of the block. With the presence of sharp-edged dust particles in the middle (between the surface and the wooden block), more friction and heat are acquired through the dust particles, which slow down the block moderately. Therefore, if I was to perform this investigation once again, I intend to guarantee the cleanliness of the surface I am working on. Another thing was the presence of wooden splinters small, but seen, on both the wooden surface, and the side of the block I was working on. These splinters most certainly would have interfered with my investigation and results. I believe this because the splinters would be between the surface and the block, causing more friction, and therefore slowing down the block, thus affecting the acceleration of this block, and giving me inaccurate results. The next time, I intend to ensure that the surface lack any external effects which might alter my investigation, for the worst. Something else was that the marble was not just one straight block which would have been quite suitable for this particular investigation. In fact, it was a working bench, and it was made up of several tiles. (The tiles had a smooth surface without any drawing or grooves on). The small cracks between each tile might well have affected the velocity of the block; causing it to slow down before reaching the desired marker. This would have given me some false results and would have caused the time consumed to be several seconds more than what it actually should have been. If I was to perform this investigation another time, I would try my best to use one whole tile of marble instead of several tiles, and this should provide me with some results which are more reliable. I was using my naked eye to stop the watch once the block passed the marker, so I could possibly have stopped the watch before the block actually passed the marker, or I could have started the watch several tierces (1 hundredth of a second) after letting go of the rubber band, which means that the timing was not 100% accurate. If I was to perform this investigation again; I would use one of the following: A) Light gates, B) Interrupt Card, C) Or a ticker timer. Any of the above methods would provide me with some reliable results which would be more accurate than the results I have obtained. By observing Graph A; the graph for the marble surface, the result for the 40cm marker is slightly of the line, but as I said previously this could well be due to the dust particles which were on the surface, or could also be due to the splinters available on the faces of the wooden block. It could also be due to my method of timing, either way, if I was to perform the investigation another time, by altering the errors I have identified previously, I look forward to some results which are anomaly-free, and that also contain no errors. By observing Graph B; the graph for the wooden surface, we notice that the straight line curves towards the end, which suggests a sudden change in the balancing of the pushing and the opposing forces. Scientifically, this suggests retardation, and the curve indicates that the block suddenly started to lose the force applied to it. It started off with uniform retardation, and then suddenly started to stop several seconds faster than when it had started. This means that the wooden surface is slightly rougher than the marble surface, and that it provides friction that is slightly more (higher) than that provided by the marble surface. I believe that this is what I was asked to prove. We also notice that there is a semi-anomaly; the result fir the 30cm is slightly out of line, it is slightly lower than where it should be, this could be due to one of the external factors that I have stated previously, or it could be due to some other factor that I have been unable to identify using the tools available to us. I have tried my best to identify the factors which could have affected my investigation and consequently, my results. That is of course with the equipment provided to us. If there are any other factors which I have failed to identify, that would be because of the tools provided to us. Though, I doubt that there are any other factors that could be identified using other apparatus. Overall, I believe that I have performed this investigation to a good standard, and that I have succeeded in proving my theory and prediction. I also believe that I have done what was asked of me, and proved that frictional forces are surface dependant. I have proved it with reference to my knowledge, to external, advanced information, and also with reference to my investigation. Though I have performed this investigation to a fairly good standard, I believe that it could be better and that by performing this investigation again after altering the errors I have stated above, I would be able to provide sufficient evidence and proof which is undoubted and accurate by 99%. I say this because no matter how hard I try, the equipment provided to us are not that advanced, and therefore, there will always be better methods with results which are more accurate than what I have obtained. I have therefore performed this investigation as best as I could, and hope that the results and information I have gathered are sufficient.

Free Essays on Sacrifice

Outline Introduction: Sacrifice Miracle Plays: The creation of Adam and Eve The Fall of Man - Islamic view point - Christian view point Cain and Abel - The Sacrifice Noah's Flood Abraham and Isaac - Christian view point - Islamic view point Conclusion: Sacrifice is an essential factor in miracle plays. It plays an important role in the plays and in the beliefs of people. To sacrifice something is to give up something and you never know the value of possessions until they're gone. Sacrifice, according to religious rituals means an act in which a consecrated offering is made to a god or other spiritual being in order to establish, perpetuate, or restore a sacred bond between humanity and the divine. These offerings may consist of humans or animals (blood offerings) or fruits, crops, flowers and wine (bloodless offerings). In all the miracle plays there is some sort of sacrifice, whether it be to God or within themselves. Throughout the plays sacrifice is explored. The examination of sacrifice in The Creation of Adam and Eve, The Fall of Man, Cain and Abel, Noah's Flood and Abraham and Isaac will be realized in the following passages. Although sacrifice has one meaning it is expressed in many different ways throughout these different miracle plays. The creation of man may have many different views according to the various religious aspects that there are. The Story of the Creation tells that God created heaven and earth, plants and animals, and as the last thing he created man. God said, "Let us make man in our image, after our likeness; .." (Gen.1.26). "So God created man in his own image, in the image of God he created him; male and female he created them." (Gen.1.27). There is no doubt that God created man then female, but there is an argument whether Eve was created from dust or a piece of rib from Adam. No matter what the real story is the fact remains that they ... Free Essays on Sacrifice Free Essays on Sacrifice Outline Introduction: Sacrifice Miracle Plays: The creation of Adam and Eve The Fall of Man - Islamic view point - Christian view point Cain and Abel - The Sacrifice Noah's Flood Abraham and Isaac - Christian view point - Islamic view point Conclusion: Sacrifice is an essential factor in miracle plays. It plays an important role in the plays and in the beliefs of people. To sacrifice something is to give up something and you never know the value of possessions until they're gone. Sacrifice, according to religious rituals means an act in which a consecrated offering is made to a god or other spiritual being in order to establish, perpetuate, or restore a sacred bond between humanity and the divine. These offerings may consist of humans or animals (blood offerings) or fruits, crops, flowers and wine (bloodless offerings). In all the miracle plays there is some sort of sacrifice, whether it be to God or within themselves. Throughout the plays sacrifice is explored. The examination of sacrifice in The Creation of Adam and Eve, The Fall of Man, Cain and Abel, Noah's Flood and Abraham and Isaac will be realized in the following passages. Although sacrifice has one meaning it is expressed in many different ways throughout these different miracle plays. The creation of man may have many different views according to the various religious aspects that there are. The Story of the Creation tells that God created heaven and earth, plants and animals, and as the last thing he created man. God said, "Let us make man in our image, after our likeness; .." (Gen.1.26). "So God created man in his own image, in the image of God he created him; male and female he created them." (Gen.1.27). There is no doubt that God created man then female, but there is an argument whether Eve was created from dust or a piece of rib from Adam. No matter what the real story is the fact remains that they ...

Analyzing an accountant system Essay Example | Topics and Well Written Essays - 2000 words

Analyzing an accountant system - Essay Example The owner still has a debt obligation towards his relative ($100,000) which when accounted for is severely impacting the revenues generated by the company, thereby resulting in severe losses. The expenses for the purpose of conducting the business are of random nature which does not explain the exact purpose of incurring such expenses. As an example, it can be cited that the owner of MTS spends 40% of its allocated advertisement budget on business lunches involving local theatre producers and directors and the rest 60% is spent on advertising in local newspapers, theatre programs, sponsoring local children`s theatre and delivering flyers to the community. No clear rationale can be identified from this distribution strategy. As is evident from the income statement, the expenses incurred from advertising and promotion contributes significantly towards reducing the revenues generated by the company. For a startup company which is highly leveraged, efforts are needed to be put in order t o reduce the obligations. The company needs to restrict its expenses behind advertising and promotion. ... This is particularly because these are the expenses that are most directly involved in creating revenues. As is evident from the income statement, MTS has incurred huge amount of cost of goods sold as well as administrative expenses with respect to the revenues that the company has generated. The company needs to formulate a more effective strategy in order to bring down the aforementioned expenses. One particular area that is needed to be highlighted in the income statement is the expenses incurred as a result of payment made to the employees. According to the case study, MTS is supposed to book $25,000 as expenses due to payments made to employees. However, the income statement reflects a completely different figure which is significantly higher than the actual figure that is required to be reported. This sheds light on an important concern. The concern arises due to a weaker internal control within the company. The serious error committed while drafting the income statement questi ons the credibility of the accounting official responsible for preparing the income statement. The amount recorded as payment to employees in the year is $90,999 whereas the actual amount that had to be reported was $25,000. Had it been the case, then it would have significantly improved the figure that has been reported in the bottom line. This highlights a massive loophole in the internal control mechanism of the organization. There is no perfect approach towards employing officials who are experienced in the field of accounting. This is evident from the fact that the accounting part is handled by a person who does not have an accounting background and

Anthropology Essay Example | Topics and Well Written Essays - 1250 words - 2

Anthropology - Essay Example Each and every country has its own culture and an own environment for its civilians. Similarly every area in which the people are living has also defined its own culture. This article would further examine the culture of two different tribes in two different countries, one belonging to the northern areas of Pakistan while one belonging to the country named Iran. It would define as to the culture followed by these tribes is the same or not. Thull is the name of a place which is located in the northern areas of Pakistan. The people of this area are extremely conscious about their values and culture. The people living in Thull take most of their cultural activities from the tribes of Pathans. These pathans are people with strict rules of culture and activities. They strongly follow their religion and are extremely conscious about their honor. Similarly the people of Thull have great respect for their culture. Here not only the people are following their culture properly but are also respecting it for its ethics. Similarly another area known as Zargos in Iran comprises of a group of people known as Bakhtiari are bound to their culture. These people like the clan of Thull are extremely conscious about their traditions and culture. The clan of Bakhtiari follows their ancestors from a very long time in all their actions. Like their ancestors the Bakhtiari clan migrates to different places in different seasons. They not only take their herd of sheep with them but also take their family which includes women and children during their migration. This migration is done in the winters and summers mostly. While on the other side the people of Thull do not indulge in the activities of migration. They live in the only space they are given and earn their living through the agricultural systems. However there is similarity found in the culture of these two tribes as both of these tribes earn their living

What Influences the Health of a Community Assignment

What Influences the Health of a Community - Assignment Example Education is considered as one of the top most factors that influences and has a great impact on the Pennsylvania community and its members respectively. The state spends over $14 billion on public health insurance each year. Education plays an important role in every individual’s lives. If people are educated, the number of crimes committed is very less and there is an improved public health as well. People with higher levels of education tend to live longer, healthier lives and depend less on government-funded health programs than people with less education. (Mitra, 2010) Researches and many studies have showed that education is very beneficial to a human’s life in several ways. Educated people and an educated community will have an organized lifestyle and healthy diets. They are less likely to smoke, be obese, or engage themselves in drinking. For instance, if there is any health issue to any individual in the Pennsylvania community, education will help them to have that awareness that they would know what is better for them. What measures to be taken to improve their health therefore education effects in a way that it seeks to spread awareness.

What Factors Affect the Rate of Evaporation of Water?

What Factors Affect the Rate of Evaporation of Water? Hubert Galan and Zafira Smith Introduction: Our testable question for this experiment is what factors affect the rate of evaporation of water. This testable question regards the different factors, such as the temperature surrounding the water being evaporation, the temperature of the water being evaporated, the temperature of the air surrounding the water being evaporated, the humidity of the air surrounding the water being evaporated. In order to test our question we will use a bowl of water and expose the bowl and the water inside of it, which would begin at a temperature of 30 degrees celsius, to many different conditions, such as heat lamps, and fans. In doing so we will exposing our bowl of water and water itself to the variety of different factors that we can assume are capable of affecting the rate of evaporation of our water, and by testing the each of these factors we will be able to determine which ones are actually influential to the rate of evaporation of the water being tested. Evaporation: Evaporation is when water changes form into gas. Evaporation is the main pathway that water moves from the liquid back into the water cycle as water vapor,(The Water Cycle: Evaporation). What this means is that gas or water vapors main way back into the water cycle is through evaporation, which shows the significance of it. More important information on evaporation is that energy is needed for evaporation to occur. The use of energy in evaporation is that energy breaks the bonds that hold water molecules together and which keeps the water in its liquid phase. Which is why water easily evaporates at a high temperature, because there is enough energy or heat needed to break those bonds. Evaporation is arguably the most important part of the water cycle. No evaporation would result in no rain, no rain equals no water for forest which provided the most essential gas for humans, oxygen. Overall without evaporation the effects would be destructive (Water and Global Change). What this shows is how important evaporation is in our world, and that without it we wont survive. For this reason my colleague and I are trying to answer the question what factors affect the rate of evaporation of water. Temperature: Water molecules are always moving, some molecules are hit by other molecules which cause them to gain speed. These molecules hitting each other cause the energy and the temperature to raise. Temperature is the average kinetic energy of the molecules. Slower moving molecules have a lower temperature(colder) while faster moving molecules have a higher temperature (hotter). The increasing temperature causes the water molecule bonds to break, which causes water molecules to turn into gas. The breaking of bonds of molecules is evaporation, it involves a change of state, from liquid to gas. The higher the temperature, the higher the rate of evaporation. When the temperature of water increases the water molecules gain more energy. When the water molecules temperature rises the water molecules start to move faster and thus evaporate faster. Basically the higher the temperature the higher the rate of evaporation (Factors Affecting the Rate of Evaporation). This is the most notable factor that affects rates of evaporation. The way we will test this is by having two bowls of water. One bowl will be exposed to normal conditions, while the other bowl will be exposed to a heat lamp. After twenty-four hours we will compare the mass of both bowls, and see if they change. After this we will conclude based on the data we received. Wind: Wind is the natural movement of air in any given direction. In order to test the effect of wind on the rate of evaporation of the bowl of water in our experiment we will use a fan and turn it onto the bowl of water being used. When evaporation occurs the water vapor from our bowl will be sitting just above the surface of the water in our bowl that has not yet been evaporated. When wind is added to the environment in which a body of water is in, the molecules of water vapor are rapidly moved from their resting position above the surface of the remaining water to the direction which the wind is facing. This rapid removal of molecules allows for rapid evaporation to occur because there is an increased amount space on the surface area of the remaining water which allow the water molecules to evaporate up. (How Does Wind Affect Evaporation?) This also means that with an increased speed of wind there will be an increased rate of evaporation, as the molecules sitting on the surface of a bod y of water will be removed and replaced and a quicker rate. Humidity: Humidity is that amount of water vapor in the surrounding atmosphere of a body of water, in our case the cup being used in our experiment. In order to test the effect that humidity has on water vapor in our experiment, we will put a lid over the the bowl of water we will be using for testing. Evaporation in an airtight container increases the amount of water vapor that is present in the air above the water in said container. When the amount of water vapor in the air above our water increases, there is more humidity because humidity is the amount of water in the surrounding atmosphere in a body of water. When humidity is high in the air, it is harder for water to evaporate, because the air is filled with water vapor. The air can not absorb an unlimited amount of water molecules, meaning that there will be a slower rate of evaporation. If the space that is located above the water becomes filled with water vapor, then a condensations happens to cause a balance. (Factors Affecting the Ra te of Evaporation). Condensation which is the opposite process of evaporation, is when water vapor converts to liquid, meaning that the evaporation taking place in our experiment would be countered by the condensation already occurring to the vapor within our closed cup of water. Hypothesis: If wind affects the rate of evaporation then our water will evaporate faster because wind increases the evaporation rate of water through removing the water vapor particles that will be resting above the rest of our remaining water( that has not yet been evaporated), making room for new molecules to rest in the same place. If humidity affects the rate of evaporation then our water will evaporate slower because when humidity is high, it becomes more difficult for water vapor molecules to enter their atmosphere, therefore leaving no space for more molecules and slowing the rate of evaporation of water. If temperature affects the rate of evaporation then our water will evaporate faster because when waters temperature is increased the water molecules gain more energy, which causes the molecules to move faster, break bonds faster and thus evaporate faster.*we have three hypothesis because we are trying to accurately test our questions with multiple factors in order to answer our testable question Work Cited The Water Cycle: Evaporation. Evaporation, The Water Cycle, from USGS Water-Science School. N.p., n.d. Web. 17 Nov. 2016. Factors Affecting the Rate of Evaporation. Factors Affecting the Rate of Evaporation. N.p., n.d. Web. 16 Nov. 2016. How Does Wind Affect Evaporation? Bright Hub. N.p., 18 Mar. 2011. Web. 17 Nov. 2016. Intermediate-Level Science Projects. Intermediate-Level Science Projects: What Factors Most Affect Evaporation? N.p., n.d. Web. 17 Nov. 2016. Water and Global Change. RSS. N.p., n.d. Web. 17 Nov. 2016.

The Effect of Video Game Violence on Youths Essay -- Video Gaming

Does exposure to violence in video games, on TV, and in social media have an effect on those exposed to it? Are those who are underage more susceptible to any detrimental side effects from viewing these things? This has long been a topic of discussion among lawmakers, psychologists, and the scientific field as a whole. It concerns parents and community members, especially in the wake of a seeming rise in violence at school from bullying, fighting, or in the extreme cases of school shootings. Were any of these types of incidents encouraged by exposure to violence in media? For the scope of this paper I'll only be using information from a small number of experiments, and the results generated by them. There is simply too much information out there to cover it all, however interestingly there are very few long term studies on the effects of violence in media on youths that have been completed at the time of this writing. The debate over the effects of violent video games have direct correlations, and indeed many of the same arguments as were used in the debate over the safety of violent comic books for youths which occurred in the 1950's(Hall, Day, and Hall). There were concerns that the comic books would lead to a decline in morals, an upswing in violence, and a growth of lawlessness and social deterioration(Hall, Day, and Hall). There was testimony by experts in the medical field before the Senate regarding whether or not these comics should be purchasable by children, or even in eyesight of them. (Hall, Day, and Hall) Dr. Frederic Wertham, forensic psychiatrist, gave this testimony before a Senate subcommittee using many of the arguments that we see again today regarding the safety and effects of violent video games a... ...artlett, Christopher, and Christopher Rodeheffer. "Effects of Reaslism on Extended Violent and Nonviolent Video Game Play on Agressive Thoughts, Feelings, and Physiological Arousal." Agressive Behavior. 35.3 (2009): n. page. Web. 13 Feb. 2015. . Anderson, C. A.. "Violent video games: Myths, facts, and unanswered questions." American psychological association. American Psychological Association, 2003. Web. 13 Feb 2015. Greitemeyer, T, and N McLatchie. "Denying Humanness to Others: A Newly Discovered Mechanism by Which Violent Video Games Increase Aggressive Behavior ." Psychological Science. 25.5 (2011): n. page. Web. 13 Feb. 2015.

“I Wandered Lonely as a Cloud” by William Wordsworth Essay

For my second test I choose the poem â€Å"I Wandered Lonely as a Cloud† by William Wordsworth because I like the imagery in it of the dancing daffodils. After reading the poem many times I had realized that most of this imagery is produced by the many metaphors and similes. In the first line, Wordsworth says â€Å"I wandered lonely as a cloud.† This is a simile comparing the wondering of a man to a cloud drifting through the sky. I think that the wandering cloud is lonely because there is nothing else that high in the sky besides it. It can pass by unnoticed, touching nothing. Also, the image of a cloud brings to mind a carefree sort of wandering. The cloud is not bound by any barriers and can go wherever the impulse of the wind might take it. The next line of poem says â€Å"I saw a crowd, a host, of golden daffodils.† Here Wordsworth is using a metaphor to compare the daffodils to a crowd of people and a host of angels. The word crowd brings to mind an image of the daffodils grouped together and being amongst one another. The word host makes them seem like their golden petals are shimmering like golden halos on angels. It is interesting to note that daffodils do have a circular rim of petals in the middle that could look like a halo. Later in the poem Wordsworth uses another simile, saying the dancing of daffodils in the wind is â€Å"continuous as the stars that shine and twinkle on the Milky Way.† This line creates the image of the wind blowing the tops of random daffodils up and down in a haphazard matter, so they appear to twinkle momentarily as their faces catch the sun. This goes along with the next metaphor of the daffodils â€Å"tossing their heads in sprightly dance.† It is also interesting how the first image of the wandering cloud contrasts sharply with the second image of the dancing daffodils. The cloud drifts in solitude slowly and placidly across the sky, whereas the daffodils hurry to and from in a lively way. This contrast seems to show that looking at the daffodils made the author feel better than he did before and that they in fact helped cheered him up. This idea is supported by the last line of poem, where he says his heart â€Å"with pleasure fills, and dances with the daffodils† suggesting that’s how he feels whenever he thinks of the daffodils. The speaker says that, wandering like a cloud floating above hills and valleys, he encountered a field of daffodils beside a lake. The dancing, fluttering flowers stretched endlessly along the shore, and though the waves of the lake danced beside the flowers, the daffodils outdid the water in glee. The speaker says that a poet could not help but be happy in such a joyful company of flowers. He says that he stared and stared, but did not realize what wealth the scene would bring him. For now, whenever he feels â€Å"vacant† the memory flashes upon â€Å"that inward eye. That is the bliss of loneliness,† and his heart fills with pleasure, â€Å"and dances with the daffodils.† This simple poem revisits the familiar subjects of nature and memory, this time with a particularly musical expressiveness. The plot is extremely simple, that shows the poet’s wandering and his discovery of a field of daffodils by a lake, the memory of which pleases him and comforts him when he is lonely, bored, or restless. The speaker is metaphorically compared to a natural object, a cloud and the daffodils are continually personified as human beings, dancing and â€Å"tossing their heads† in â€Å"a crowd.† The four six-line stanzas of this poem follow a quatrain couplet rhyme scheme ABABCC. Each line is metered in iambic tetrameter. This poem had great use of imagery which correlated and was shown by using similes and metaphors. The imagery Wordsworth uses is very influential, and made me feel as though I to was there to see the breathtaking sight of the daffodils. In conclusion I really liked this poem. The poems we had read before were not this rhythmic and pleasant to the ear. This poem sounded to me like a song. Overall this poem is very peaceful and gives off a feeling of tranquility. It is about a man confronting external nature and how with his imagination it can fulfill him. His creativity seems to be encouraged by the nature around him. I believe that the main theme of this poem was nature and the tone used was serious. The occasion was him remembering the sight of nature the daffodils and the â€Å"lonely cloud.† He is in a way showing us how he likes to reflect on nature and use it as an inspiration.

5 Simple Exercises for Truck Drivers

5 Simple Exercises for Truck Drivers Forget traffic jams and treacherous road conditions- the real scourge of truck drivers everywhere is back pain! It can be more than a nuisance, it can be career ending! Yes, as a driver you’re going to spend lots of hours sitting behind the wheel. But that doesn’t mean you have to just sit   and wait for back pain to happen, and just accept it. TheHealthyTrucker.net has a plan to drive away back pain with five helpful exercises.1. Back bendsPlace your hands on your hips, behind your back. Then lean back and hold for 5–10 seconds; complete 5 reps. This will really help decompress your spine!2. Front bendsPlace your hands on your hips, behind your back. Then lean forward and hold for 5–10 seconds; complete 5 reps. This will help loosen up your hamstrings and increase leg circulation.3. Side bendsPut your hands to your sides; raise one hand and stretch it to the side for 5–10 seconds, as if you were trying to reach something. Then do it with the othe r hand; complete 5 reps. This will help lengthen your torso muscles and stretch your outer hip muscles.4.  Knees upFind a wall or use the side of your truck for this one. Place your hands apart, just outside of shoulder width, and bring each knee up, one at a time, turning it to the side and taking it across your body for 30–60 seconds. This will help loosen and strengthen your glutes and stretch your pelvis.5. Neck stretchPlace one hand to your side and stretch the other out 90 degrees, and then lean your head to the opposite side. Using your outstretched arm, try to reach out as far as you can and move your neck as far as you can the opposite way. Do this for 5–10 seconds and repeat with the other arm; complete 5 reps. This will help relieve tension in the shoulders and neck. Use these exercises to help put back pain in your rear view mirror- and keep it there for good!

Beauracracy essays

Beauracracy essays In a democratic society, we the people elect representatives to carry out our needs and trust in them that they will carry out that representation in an efficient and responsible manner for the best interest of the public they are representing. That United States government as a legislature, executive branch, and a judiciary branch carries out that responsibility usually with much success and fairness. When the government becomes almost controlled by bureaucracy, that is when our republic becomes undermined and the democratic government that we entrust is, falls apart. The bureaucracy is permanent or ongoing structure that will always exist and will never be replaced. It is comprised of individual groups of government working to finish a common task. It is made up of supervisors upon supervisors who all have a specific job so that the end task is completed with preciseness and in an expeditious manner. The thing that ends up happening is that while the legislature may make the law and the executive branch may have to administer them as supervisors, but what ends up happening is that it is the supervised who do the work and often they exceed their authority. When they do, the entire system is undermined. The executive and legislative branches have created laws and regulations to control bureaucracy as a whole. The bureaucrats often times tend to step on the shoes if you will of the two branches and take matters into their own hands and completely disregard the law. In drafting and enforcing the regulations they issue under the laws passed by the legislators, they often act in excess of their legal authority. Such things they do are unconstitutional. A recent example of this is an issue that came up with the FDA. The FDA attempted to create rules and regulations concerning smoking and tobacco. The almost passed the laws until the government said that is was against regulations and they couldnt do it. ...

Epidemly and biostat Assignment Example | Topics and Well Written Essays - 1250 words - 1

Epidemly and biostat - Assignment Example The objective is to evaluate one or more new treatments for a disease or condition. Intervention trial therefore involves choosing a sample from the diseased people to investigate there rare disease and undertake a follow up condition. Q2. What statistical method(s) a researcher can use to determine if the mean body mass index of the population is the same for three groups of subjects (group1=diet restriction; group2=exercise; group3=none). (EACH IS TWO POINTS =TOTAL=SIX POINTS) Q3. Ã… ¶ represents the predicted value of y calculated using the equation Ã… ¶ = a + bx. In the formula, SBP = 34 + 0.2 x; where x = value of postnatal age (hours) for the neonates ≠¤ 1,000 grams? What is the value of the intercept (a)? What is the value of the slope (b)? (TWO POINTS) Q5. An equation indicating that systolic blood pressure or SBP = 30 + 0.4x. If the value of x is postnatal age of 20 hours, what is the value for Ã… ¶ or SBP for neonates ≠¤ 1,000 grams? Show your calculations. (TWO POINTS) Population attributable fraction is a statistic used to estimate the proportional reduction in average disease risk over a given time interval that would be achieved by eliminating the exposure of interest from the population while distribution of other risk factors in the population remain constant. This means that 85% of the cases of a disease could be avoided if the factor causally related to increase risk is eliminated and that the distribution of other risk factors remains unchanged. Q9. The death rates from various conditions are often compared across geographic areas. These comparisons are usually based on directly age-standardized mortality rates. Which of the following best describes what is meant by an age-standardized rate created by the direct method? (Choose one best answer and provide rationale). (TWO POINT) Q12. The strength of an association is one of the criteria for

Animal Human Cultures Essay Example | Topics and Well Written Essays - 2000 words - 1

Animal Human Cultures - Essay Example In this regards, Goodall (1993) narrated various instances illustrating the sufferings of both humans and nonhumans targeting on the role played by humans as protestors, when the human society itself is suffering by almost a similar degree. He even debates on the significance of such arguments or rather protests made by humans stating the sufferings of non-humans to be greater. It is in this context that the sufferings of human and nonhuman beings have emerged as a subject of great dispute suggesting that both should be provided with certain degree of prominence. Although unnecessary suffering of nonhumans is brutal, sufferings of human beings can also be proved as similarly terrible (Goodall, 1993, pp. 10-18). This paper describes the significances of suffering of nonhuman beings and human beings from different perspectives based on the statement of Goodall (1993) that â€Å"Who are we to say that the suffering of a human being is more terrible than the suffering of a nonhuman bein g, or that it matters more?† (pp. 15). The objective of the paper is to understand the viewpoints of both types of sufferings and develop a rational understanding towards the issue. Discussion There is rising awareness among the human society about abuse of nonhuman beings in zoos, forests, households and even circuses. ... There are also circumstances of suffering among humans with respect to being tortured by the police and other powerful status holders. At times, it has also been observed that the children are intentionally distorted after destroying their body limbs (such as eyes, hands or legs) in order to make them begging. Besides, humans were also sold in return of money or being forced to adopt prostitution and other unkind living styles. Thus, no matter how people raise voices against suffering of nonhuman beings, it cannot be misled by the fact that human beings also suffer from same misery compared to the nonhumans (Goodall, 1993, pp. 10-18). Value of Human and Nonhuman Beings There is increasing concern among people about the value of human as well as nonhuman beings. Generally, human beings attempt to increase cognizance about sufferings of nonhumans who are raised in firms, zoos, laboratories or in circuses developing legislation in order to protect them. However, they delude themselves b y believing that human also suffer similarly in comparison with nonhumans (Goodall, 1993, pp. 10-18). Based on this particular thought, it can be argued that in recent phenomenon, an increasing importance have been rendered towards protecting the genre of nonhuman species treating the humans to be the superior most and certainly the liable one to take the plunge. The increasing rate of environment protection awareness can also be identified as a rudiment towards such notions rather than focusing on their sufferings. But, does that mean values of nonhumans are more than the humans? It is true that nonhumans are imprisoned in zoos, and exploited for public entertainment. They are