Please help explain behaviour of squash balls

In summary, the forum member is seeking an explanation for the phenomenon of squash balls bouncing higher at higher temperatures. They want to avoid discussing air pressure and are curious about the effects of heat on the rubber material and its molecular chains. They also mention an article that discusses this topic and concludes that air pressure is not a significant factor in the bounce height.
  • #1
cubozoan
8
1
Dear forum

I have set AS physics (in england) coursework where the students drop squash balls at different temperatures and measure the bounce height. Yes, I know it is mentioned a lot but haven't so far found a good explanation.

Their results will show that the higher temperature rubber balls bounce higher. They have seen a squash ball dropped (and bounced well!) when taken out of liquid nitrogen. I think it is because the squash ball had 'glassy' properties.

I want to know how the students can explain how the balls bounce higher when heated?

I want to avoid talking about air pressure in the ball - as this deviates from the behaviour of rubber materials.

Some textbooks mention that rubber contracts with heat and will stiffen? Others say the rubber will become softer! And how would this relate to higher bounces?

Does energy from inelastic collision with floor go into heating a cold rubber ball and so lower bounce? and so a warm rubber ball would receive less heating and more kinetic energy?

How does heat effect the chains of molecules? Do warmer molecules behave more elastically?

Would really appreciate your help.

Kind regards

Andy
 
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  • #2
There is an article by Lewis, Arnold, and Griffiths which addresses some of these questions.

Their conclusion by the way was that the air pressure is not particularly important, so it's mostly changes to the (lossy) behavior of the rubber that causes a warmer squash ball to bounce higher.
 

1. How does the hardness of a squash ball affect its behavior?

The hardness of a squash ball determines how much it compresses upon impact. A softer ball will compress more, resulting in a slower and less bouncy behavior, while a harder ball will compress less, leading to a faster and more bouncy behavior.

2. Why do squash balls lose their bounce over time?

Squash balls are made of natural rubber, which can deteriorate over time. As the ball is used, it becomes warmer and softer, causing it to lose its bounce. Additionally, the constant impact against the walls of the squash court can cause the rubber to wear down, further reducing its bounce.

3. What is the difference between single dot and double dot squash balls?

Single and double dot squash balls have different levels of hardness. A single dot ball is softer and slower, while a double dot ball is harder and faster. The choice between the two depends on the player's skill level and individual preference.

4. How does temperature affect the behavior of squash balls?

Temperature can significantly impact the behavior of squash balls. A warmer ball will be softer, resulting in a slower and less bouncy behavior. On the other hand, a colder ball will be harder, leading to a faster and more bouncy behavior. Players should adapt their game accordingly depending on the temperature of the court.

5. Why does the color of squash balls vary?

Squash balls can come in various colors, such as yellow, red, and blue. These colors represent different levels of hardness. For example, a yellow ball is the standard competition ball and has a medium level of hardness, while a red ball is softer and used for beginner players. The color-coding system helps players select the appropriate ball for their skill level.

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