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# What affects the bounce of a Squash Ball?

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Introduction

What affects the bounce of a Squash Ball? Aim The aim of my experiment is to discover how altering the temperature of a squash ball affects its bounce. Variables * Changing variable: The variable that I will be changing is the temperature. I will be raising and lowering the temperature of the water contained in the beaker to change the temperature of the squash ball, and use my results to find out how the change of temperature affects the height of bounce of the squash ball. The input variable is heating the squash ball and therefore the output variable is the height the ball reaches. * Fixed Variables: The material of the squash ball must be kept constant throughout the experiment, as it could interfere with the results if changed. The size of the ball is kept constant to sustain a fair test. I will also be dropping the ball vertically to keep the angle variable constant. Therefore, it will hit the ground at a 90� angle each time. ...read more.

Middle

Three readings of each temperature will be recorded. Prediction I predict that as the temperature increases, the height of the bounce will also increase. This is because there are air molecules inside the squash ball. When you supply heat energy to the air molecules inside the squash ball, it increases the rate at which the molecules move, which creates kinetic energy. Therefore the molecules will begin to hit the inner walls of the ball with a greater force, which in turn makes the internal pressure increase the bounce. As the air molecules inside the ball move, they create more kinetic energy. Therefore, the higher the pressure, the higher the bounce of the ball. The squash ball was dropped from a constant height of 500mm/50cm throughout the preliminary experiment. I will be using the same height for my main experiment. Method I carried my main experiment out just as I did to obtain my preliminary results. ...read more.

Conclusion

Even though the water was at a known temperature, when removed, the ball cooled and so the temperature recorded from the water, was not the actual temperature of the ball when dropped. The perfect equipment for this experiment would have been a video recorder with a slow motion option. This would have given us the chance of replaying the incident and noting down the correct bounce height. The figures recorded for each temperature were quite reliable seeing as though they are all within 2�c of each other. However, this still might be too wide of a gap and therefore would mean the results are not reliable enough. To make sure of the reliability of my results, I would have to record more results and identify the anomalous data. For example, for my results at 80�c, there is a range of 3�c between my 2nd and 3rd attempt. However, in my first set of results at 20�c, there is only a gap of 1�c between each of the three. This means that my results at 80�c are less reliable than my others. ?? ?? ?? ?? 1 ...read more.

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