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# Golf Science Fair Project: Temperature and Rebound

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### Problem

How does boiling and freezing affect a golf ball’s bounce?

### Materials

• 1 yard stick, meter stick or tape measure
• 45 identical golf balls
• Pen and paper
• Freezer
• Stove
• Pot
• Water

### Procedure

1. Divide golf balls into three equal groups of 15 balls each.
2. Put one group of golf balls in the freezer for two hours.
3. Drop each frozen golf ball from 3 feet and record each ball’s rebound height. You can use this procedure in order to determine the average rebound height of this group of golf balls.
4. With an adult’s help, boil the next set of golf balls for about 10 minutes.
5. Using a pair of tongs, carefully remove your golf balls from the boiling water. Use the tongs to drop each boiled golf ball from 3 feet and record each ball’s rebound height.
6. Leave the last group of golf balls at room temperature.
7. Drop each room temperature golf ball from 3 feet and record each ball’s rebound height.

### Results

The golf balls at room temperature bounced the highest, meaning that they demonstrated the greatest elasticity.

### Why?

Even though golf balls feel pretty rigid when you hold them, they’re actually manufactured to have a fairly high elasticity: While the outside is usually made out of hard plastic, the core is usually made out of firm, compressed rubber or even liquid.

Room temperature golf balls perform the best, because they haven’t been altered by exposure to drastic temperatures like boiling or freezing. Freeze causes the cores of the golf balls to become more rigid and brittle, losing their elasticity. Boiling causes the cores of the golf balls loses the molecules up, making them less able to regain their shape when exposed to an outside force. In both cases, these extreme temperatures change the molecular structure of the golf balls, causing them to lose their elasticity.

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