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Why do squash players warm up the ball before they play?

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Introduction

Why do squash players warm up the ball before they play? Hypothesis Warming up the squash ball helps it bounce higher. Variables: Type of Surface Height of Drop - Independent variable Temperature of Ball Material of Ball Acceleration Due To Gravity Mass Angle of Surface Air Resistance Diameter of Ball Height of Bounce - Dependant Variable Plan I aim to find out if warming up squash balls before bouncing them affects the height of its bounce. I will need a squash ball, a meter ruler, goggles, a Bunsen burner, a heat proof mat, a tripod, a beaker half full of water, a thermometer, wire gauze and some tissue. I will set up the apparatus as shown in diagram and then drop the ball from 100cm and measure how high it bounces. I will do the first test before heating it so that I have one result at room temperature. ...read more.

Middle

This means that when it hits the ground the atoms push each other way forcing the ball to bounce higher. When the temperature is lowered the opposite occurs because the atoms have less energy and therefore push each other further away. If the experiment was carried on for higher temperatures then I predict that parts of the ball would begin to melt, because at certain temperatures as the atoms get more energy and break their bonds turning the ball into a liquid. A theory, which links into this experiment, is the kinetic theory. This is because the kinetic theory deals with atoms vibrating as they receive more energy and they then break their bonds. This is linked to this experiment as the squash ball's atoms get more energy and vibrate more before breaking their bonds to become a liquid when the ball hits a critical temperature. ...read more.

Conclusion

I can say that looking at my results when I repeated results they were quite close together. I think that I did the experiment quite well although I found it hard to spot where the ball bounced too. This is why I did an average over 3 measurements. To improve the experiment I would need to use specialist equipment like lasers so I could be sure where the ball bounced too. Ways in which I could extend this experiment are to use a different kind of rubber in the ball so that it doesn't melt at such a low temperature this way I could carry on to see whether the kinetic theory is still right at higher temperatures. Also I would like to see what happened when the ball was at 0 degrees Celsius. I would like to do this to see whether the atoms still vibrated causing the ball to bounce. If it did I would like to carry on getting lower and lower to see whether there was a temperature where the atoms no longer vibrated (Absolute Zero) ...read more.

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