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I am going to do an experiment on how high a squash ball bounces at different temperatures from the same height.

Extracts from this document...

Introduction

Karl Thierry

Squash balls

Introduction

I am going to do an experiment on how high a squash ball bounces at different temperatures from the same height.

Theory

When a squash ball hits the wall the air molecules inside the ball heat up and make the ball warm.  When they move faster they hit the rubber wall harder therefore makes the ball hotter.  The reason why the ball moves faster is that when the ball hits the wall it causes friction and the molecules move faster an hit the wall harder therefore hotter molecules move faster and cold molecules move slower.  When the ball is cold there is low internal pressure and when the ball is hot there is high internal pressure which makes the ball bounce better, it also makes it bigger.  More energy is absorbed when the ball is hot; the ball also expands when it gets hotter.  A ball

...read more.

Middle

Apparatus

Method

  1. Set apparatus.
  2. Put ball in beaker.
  3. Wait till temperature reaches 100°C.
  4. Use tongs to take ball out of water.
  5. Drop ball from a height of 1m.
  6. Put ball back into beaker and wait for five minutes.
  7. Repeat process 2 more times.
  8. Lower temperature to 80°C and wait for five minutes.
  9. Take ball out and drop from 1m.

10.Repeat as above for temperatures-60°C, 40°C, 20°C and 0°C.

12. Put results into a table.

Fair test

I am going to use the same ball and drop it from the same height.  The only thing I am going to change is the temperature.

Accurate

I repeated the experiment 3 times, then took an average result to remove any odd results.

Number and range

I have chosen this range because it is easier to prove the height that the ball bounces.

Safety

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Conclusion

°C the ball bounced at 28cm, 26cm and 28cm, and at 80°C the ball bounced at heights of 59cm, 58cm and 57cm.  My evidence is good enough to support my conclusion because it is accurate and reliable, it was also a fair test and there was a good number and range.  This means that I could use my results to look and test my theory.  I am going to extend my findings by heating up a cricket ball.  I am going to explain an experiment that

could measure the same thing in a different way e.g. instead

of measuring the height of the bounce at different temperatures I am going to find out the distance of the bounce against a wall with the same force and with different temperatures.

...read more.

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