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Why does a squash ball bounce higher when it is warmed up?

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Emma Dovaston 11GG

Science Coursework: Squash Ball Investigation


To find out “Why does a squash ball bounce higher when it is warmed up?”


I predict that for this experiment the higher the temperature, the more the ball will bounce. I put this down to the temperature is raised, the particles inside will gain energy therefore the higher the ball will bounce.


For this experiment I will use the following equipment to do this experiment: -

  1. Beaker
  2. Bunsen burner
  3. Splints
  4. Tripod
  5. Gauze
  6. Thermometer
  7. Squash Ball
  8. Paper Towels
  9. Meter Ruler

10. Tongs

11. Stop Clock

12. Safety goggles.


Choose one yellow spot squash ball. This will be used throughout the experiment to ensure that the ball is made of the same rubber and same size. The experiment will be carried out on the hard floor tiles of the science laboratory. The area will be clean to ensure there are no irregularities on the surface.

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I am going to work out pressure and predicted hang time using the following formulas.

This is how to work out pressure; P1 is Pressure 1, which is always 1. T1 is Time 1 and T2 is Time 2.  

                                                                               This number changes as you

                                                                               work out P1, P2 P3 etc.

                                                                                Eg. P1 = P1, P2 = T2 etc.

P1 x T2


To work out predicted hang time you use this formula. In this formula P1, P2 etc are Predicted hang time.

                                                                               This number changes as you

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Use a different way of timing the balls impact to the ground; a touch sensitive timer mat would work well.I would try different surfaces on which the ball lands on, this could be thought of as another variable I could develop.

If I were to do this experiment I would change the temperatures to smaller differences i.e. 273 Kelvin, 278 Kelvin etc. to see if I could find an ideal temperature that had a good enough ‘bounce’ to help develop work into elasticity of the balls material.

 If I were to develop this experiment further I would test elasticity. To test this I would experiment with a range of different squash balls. I would cut them into equal narrow pieces and use a Newton spring to test how much the piece of squash ball could hold and how long it would take to reform back to its original shape, for this I would use a Newton spring and stop clock.

All in all I think I conducted myself well on this experiment and have learned a lot.

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