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Investigating the speed of a spherical object on a slope.

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Introduction

Year 10 GCSE Practical Assessment Physics Plan Investigating the speed of a spherical object on a slope Variables The following is a list of variables that I could change in my experiment. I may vary: * Material of slope (e.g. the ramp could be wood, metal or plastic) * Friction of slope (e.g. the ramp could have water on it or ridges) * Colour of slope (e.g. the ramp could be blue, red or green) * Size of slope (e.g. the ramp may have a small width across or length from top to bottom) * Temperature of slope (e.g. the ramp could be at room temperature or at lower temperature) * Height of slope (e.g. the ramp could be at 70cm from a surface or 20cm) * Angle of slope (e.g. the ramp could be at 90 degrees or 40 degrees from a surface) * Length of measurement (e.g. the spherical objects speed could be measured over 1m or 0.5m) * Material of spherical object (e.g. the object could be marble, rubber, plastic, metal, leather, glass or wood) * Type of spherical object (e.g. the object could be a tennis ball, marble, ball bearing, squash ball, rubber ball, hollow plastic ball or golf ball) * Friction of spherical object (e.g. the object could have ridges on it like a golf ball) * Colour of spherical object (e.g. the object could be blue, green, red or white) * Size of spherical object (e.g. the object may have a small diameter or circumference) * Temperature of spherical object (e.g. the object may be higher or lower than room temperature) * Mass or weight of the spherical object (e.g. the object could be heavy or light) The variable I am going to use is 'Height of slope'. I am going to investigate what effect changing the height of the slope (height measured from the table or surface I am working on in cm) has on the speed of the ball as it travels down the slope. ...read more.

Middle

slope* Time for marble on a 70 cm high slope* 1 2 3 4 *Time for marble traveling over 1m with the slope resting on clamp stand at height of ...cm from work surface. Safety To make the investigation safe I will do things such as: * Make sure I am not in the way of anyone else in the working area so that fast moving or heavy apparatus (e.g. marble traveling fast, heavy clamp stand falling) don't hurt him or her or me. * Catch or stop the marble, in some way, from rolling out of my working area as it comes of the slope. This will prevent the marble interfering with other pupils so no one is hurt. * Not walk through other peoples experiments incase I disrupt there experiment hurt them or hurt myself. * Make sure the clamp stand is in no way going to fall or let the slope drop by checking if it is secure on every test. This will prevent the clamp stand or ramp damaging any pupils. * Make sure the slope is resting on a secure work surface that can take the weight and will not let the slope slip. This will prevent injury from the slope hitting any pupils. * Make sure I do not leave bags, books or apparatus that is not in use around my work area or anyone else's so that it does not disrupt experiments or cause injuries. I will keep equipment in a safe place (e.g. under the table). Preliminary Work Summary My 'preliminary work' helped me to decide how to plan this experiment by providing me with a good look over what variables I could work with. It gave me the chance to test out all of the variables and figure out which one I would be best suited working with. Some of the variables I tested would have been very hard to use and it would be hard to come up with accurate results and a sensible evaluation. ...read more.

Conclusion

I think my measurements fit relatively well on to my graph although I have been left with a few anomalous points, I feel this has happened because of inaccurately reading my pulse wrongly at points. To improve my results and avoid anomalous points I could have used a heart rate monitor to take my pulse, this would be much better and more reliable than taking it myself as I did. Alternatively having someone else to record my pulse leaving me to concentrate on the exercise, it was difficult to both perform the exercise, and then be responsible for recording the results and made it easier to make a mistake. Most of my anomalous points occur further towards the point where I stopped exercising, this may be because my heart rate was highest at these points so I may have miscounted because the beats were too fast. My results look relatively similar to each other apart from some results which occurred later in the experiment. These results are probably due to inaccurate recording of my pulse. Other than this my graphs are very similar to each other. My results support my conclusion reasonably well. The graph helps to support my conclusion because most of the points fit to the line of 'best fit' and the line itself clearly shows what I am trying to get demonstrate in my conclusion. The line of 'best fit' should have taken one of two shapes, either rise in a straight line then fall in a straight line at a lower gradient or do the same but fall at a curve slowly straightening itself out. An important point to remember is that my results are unique to fitness or after people of similar fitness. If someone fitter/unfitter than me did this experiment the graph would look relatively the same, however their pulse rates results would be lower if they were a fit person or higher if unfit. Therefore my conclusion works for everyone. Page 1 Tom Johnston ...read more.

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