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Bouncing balls.

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Physics investigation Bouncing balls Preliminary work: Squash balls are made of a rubber compound. They don't bounce unless they are hot, above room temperature. Squash balls aren't very bouncy at all. They deform when they hit a wall or the floor, and a lot of the energy gets converted to heat during this collision. When a squash ball heated up over the cause of a game its will start to bounce more, the rubber gets more flexible and the particles of air in the ball move quicker. Efficiency of ball = Useful energy out x 100 Useful energy in Efficiency = Hb x 100 Hd Aim: To investigate the effect on the bounce of a squash ball if it's dropped when, the temperature of the ball is changed. ...read more.


Next I will fill one beaker with ice and another with boiling water. Then place one ball in each beaker leaving the third ball. This balls will all be bounced at different temperatures, from below 0�C TO 100�C. the test will be done 3 time for each temperature to get more accurate results. Then I will drop the three balls from equal heights (1M) to see how far they will bounce up again. The balls will have to be dropped from an equal height so the test is fair. This is a list of the equipment I will need: * Water * ice * 2X beakers, squash ball * stop watch * meter ruler Key factors: There are some controls that I need to take into mind. ...read more.


0�C 3 4 3 3.3 3.3% 20�C 8 10 8 8.6 8.6% 40�C 18 17 17 17.3 17.3% 60�C 30 31 29 30 30% 80�C 45 50 40 45 45% 100�C 60 61 61 60.6 60.6% Evaluation: I think that my experiment went well, there were on odd results as my line of best-fit matches most of the points on the graph. If I did the experiment again I would use a web cam to look at how the ball bounces. A web cam would take pictures frame by frame so I could see exactly where the ball bounces. This would give better more accurate results. If I did any extinction work maybe I could look at different surfaces for bouncing the ball. E.g. on carpet you may get different results, more or less bounce. Simon de Fraine 10EJM ...read more.

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