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# Bouncing balls: Physics coursework

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Introduction

Bouncing balls: Physics coursework Plan: It has been observed that squash players seem to warm there ball up before a game, and it seems to affect the bounce. Variables There are several factors which will effect the bounce of the ball, They are: * The height that the ball is dropped from. * The temperature of the ball. * The mass of the ball. * The force at which the ball is thrown with. * The surface of the ball (if it is hard or soft) The factor I am going to look at will be the temperature of the ball when it is dropped. The variables that I will not change are * The height that the ball will be dropped from, * The ball I will use and * The surface the ball is dropped on. I will use all the same equipment. The only thing I will change is the temperature of the water, and in turn the ball Equipment list: * 1 squash ball * 1 clamp stand * 1 table * 2 meter sticks * 1 heat mat * 1 tripod * 1 gauze * 1 beaker * 100cm� of water * 1 thermometer * 1 pair of tongs * Several paper towels Diagram Preliminary work Before I conducted my experiment I carried out some preliminary work. ...read more.

Middle

Place the squash ball into the beaker and begin to heat the water. Heat it until the thermometer reaches 20�C. When this occurs quickly remove the Bunsen burner so that the water does not keep heating. Remove the ball using the tongs and dry it using a paper towel, this is to remove any water from the ball. Water may effect the bounce height and there is no way of making sure that each bounced ball has the same amount of water on it, so it is best to remove all water. Try to do this quickly so the ball does not lose too much heat and then drop it from two meters. A person should lie on the floor with his eyes level with the point where he expects the ball to bounce. 4. Record the measurement using the meter stick and someone's eyes. Wipe the floor of any water because this may effect the bounce height. Put the ball back into the water to reheat the ball. Reheat the water if necessary. Drop the ball two more times, stopping in between to reheat the ball. 5. Repeat these steps except heat the ball to 30�C, 40�C, 50�C and so on until you reach 100�C. Safety measures * I will wear safety glasses at all times to prevent and water splashing in my eyes. ...read more.

Conclusion

" After carrying out the experiment I have found my prediction was wrong. I have found when the molecules of air are heated they gain more energy so will move faster. This means they will hit the sides of the ball at a faster rate causing a higher pressure inside the ball. The ball will become more firm and harder to squash. This means that when the ball hits the floor it will not squash as much, and less surface area will touch the ground. This means that less energy is lost through the ball to the floor and the ball will bounce higher. However I also found the increase in heat did cause the surface of the ball to become softer because the ball increased in size slightly, but this did not affect how high the ball bounced. Evaluation: I have no anomalous results. All my results follow the pattern and fit well into the pattern. My results are by know means exactly correct but they are not positioned far from the line of best fit. This shows that I did conduct my experiment effectively and reliably. This means it would be difficult to improve the reliability of my results, this is because the experiment was carried out in a school science lab, and a school would not possess the equipment needed to gather more accurate results. Further Work ...read more.

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