Archive for bounce

The Effect of Temperature on How High a Rubber Ball Bounces

Posted in School Work, science with tags , , , , on December 22, 2008 by technowyvern

PREFACE

Elasticity is the ability of a material to return to its original length, shape, or size immediately after a deforming force has been removed.

OBJECTIVE

To determine the effect of temperature on how high a rubber ball bounces.

MATTERS

  1. Does temperature effect the height of a rubber ball’s bounce?
  2. In what kind of temperature does a rubber ball bounce higher?

HYPOTHESIS

  1. Temperature does effect the height of a rubber ball’s bounce.
  2. A rubber ball will bounce higher in a hot or warm temperature.

MATERIALS & TOOLS

  • Pencil
  • Thermometer
  • Freezer
  • Two rubber balls
  • Boiled water
  • Ruler

PROCEDURE I

  1. Two rubber balls with the same shape and size are prepared (the colour is Turquoise and Orange)
  2. The Orange ball is being put in the freezer (O° C) for a couple of minutes.
  3. The temperature of the freezer is measured using a room temperature thermometer.
  4. The Orange ball is dropped from 1 m height and being caught at its arch point (highest height of bounce).
  5. Height of the bounce is measured by marking a wall and by counting the mark height using a ruler.
  6. The steps are done repeatedly.
  7. Result is noted on a paper.

PROCEDURE II

  1. Water is boiled until it reaches 100°C.
  2. The Turquoise ball is being put into the boiling water for 5 minutes.
  3. The Turquoise ball is dropped from 1 m height and being caught at its arch point.
  4. The rest of the steps are the same as the previous procedure.

PROCEDURE III

  1. The Orange and Turquoise rubber balls are placed in a normal temperature room (the temperature is measured using a thermometer) for a few hours to get them back to their original temperature.
  2. Both balls are dropped from 1 m height by turns and being caught at their arch point.
  3. The rest of the steps are the same as the previous procedure.

DATA & RESULT

Orange Ball Bounce Record   Turquoise Ball Bounce Record

Both Balls Bounce Record (100°C & 0°C)

ANALYSIS

  • Because the balls weren’t tested at a 28°C from the start, it cannot be assured whether they have different bounce heights from the beginning.
  • After being boiled, the Turquoise ball gets a little sticky. On the contrary, the Orange ball’s surface was really smooth after being frozen.
  • When the balls were put out from hot or cold temperature, the bounce height decreases.
  • The frozen Orange ball bounced higher than the boiled Turquoise ball.
  • There seems to be about 5.375 cm difference between the bounce height of both rubber balls.

EVALUATION

  • The rubber balls do work like how they should when they are dropped to the ground: “When a ball is dropped to a hard floor, it will rebound. But even the bounciest ball will not bounce back to its starting position.”
  • “The height of the bounce increases as the temperature increases is because as the temperature of the ball has increased, this heat has two effect: the air inside the ball becomes pressurized, and the rubber compound from which the ball is made becomes more resilient.”
  • The rubber balls used in this experiment don’t have any air inside of them. Instead, they are a solid material. This makes the theory of pressurized air doesn’t work with these kind of rubber balls – which explained why temperature doesn’t effect much of their bounce height.

CONCLUSION

  1. Temperature does effect the bounce height of a rubber ball (it is resulted in this experiment that the bounce height changed after the balls were being put into boiled water and freezer).
  2. The rubber balls used in this experiment don’t work the same way as a squash ball etc., so the bounce height wouldn’t increase as the temperature goes higher.