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Aim: To find out what affects the height to which a ball bounces. Variables: Height from which the ball is dropped Mass of the ball Material ball is made from External factors, i.e. changing air density, temperature The surface onto which the ball falls Prediction - reasons for variable control: Variables that will be altered: The height the ball is dropped from will affect the height the ball bounces to due to the energy chain the ball goes through as it is dropped and bounces up again. The energy chain is as follows: Therefore as energy cannot be created or destroyed the energy the ball starts with must be directly proportional to the energy the ball finishes with, at the top of its bounce, and so if the ball starts with more energy it must therefore finish with more. As in both cases the main form of energy is GPE it follows that...

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