Optimal Compression for Soccer Balls: Official Circumference and Pressure

In summary, the conversation discusses the appropriate amount of compression for a soccer ball between two objects in order to ensure safety and maximize friction. The values used are the official circumference of 70 cm and a pressure of 13.5 psi. The safe pressure for the ball is a limiting factor and it is recommended not to exceed 30 psi. The conversation also mentions making assumptions for rough estimates and the importance of knowing the burst pressure of the ball. It is suggested that a football manufacturer may have conducted a bursting test for safety reasons.
  • #1
Blades0fChaos
7
0
How much should a soccer ball be compressed between 2 objects for it to be safe for the soccer ball but also to maximize the friction between the ball and the objects. The values used for this should be the official circumference of 70 cm and a pressure of 13.5 psi.
 
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  • #2
Well, static friction is modeled as proportional to the force between the two surfaces involved. So to maximise friction you need to maximise the force.

Your 'safe for the soccerball' is probably going to be your limiting factor. I really have very little idea how much pressure a football can withstand. But as a tyre has about 30 psi and makes a pretty big noise if they burst I'd say you probably don't want to go above that.

I going to make some further assumptions to get a rough estimate, I wouldn't recommend basing any experiments on these calculations as they could be dangerous.

Assuming the football is a cube, and keeps a constant cross-section (isn't physics great). Compressing it so it's 2/3 it's diameter in the compression direction would reach 27 psi. The 2/3 arises because the pressure you're referring to is pressure with reference to atmospheric, rather than absolute pressure.
 
  • #3
That helps a lot thanks.

Does anyone know of someone doing an experiment much like this?
 
  • #4
No, but the critical thing here is the pressure. 13.5 psi is the inflation pressure of the ball, but it isn't the pressure that it can safely withstand (burst pressure). If it were the burst pressure, it would burst the first time someone kicked it. So what you really need to know is the burst pressure. Then when you compress it between two plates, you use geometry to find the new volume and pressure of the ball when a certain force is applied. That's not a simple geometry problem, but it is doable.
 
  • #5
There's a small chance that a football manufacturer has to do a bursting test for some safety reason...other than that I can't really think why anyone would want to do it!
 

FAQ: Optimal Compression for Soccer Balls: Official Circumference and Pressure

1. What is the optimal circumference for a soccer ball?

The optimal circumference for a soccer ball is between 27 and 28 inches (68.6-71.1 cm). This measurement is taken around the middle of the ball and is the standard size for all official soccer balls.

2. Why is the optimal circumference important for a soccer ball?

The optimal circumference is important for a soccer ball because it affects the overall size and weight of the ball, which can significantly impact the game. A ball that is too large or too small may not perform as well, and may also result in injuries to players.

3. What is the recommended pressure for a soccer ball?

The recommended pressure for a soccer ball is between 8.5 and 15.6 PSI (pounds per square inch). This pressure range provides the right balance of bounce and control, allowing the ball to maintain its shape and performance during gameplay.

4. Why is maintaining the optimal pressure important for a soccer ball?

Maintaining the optimal pressure is important for a soccer ball because it ensures that the ball has the right level of bounce and control. If the pressure is too low, the ball may not bounce properly and can be difficult to control. On the other hand, if the pressure is too high, the ball may be too hard and can cause injuries to players.

5. How often should a soccer ball be checked and adjusted for optimal pressure?

A soccer ball should be checked and adjusted for optimal pressure before every use. This ensures that the ball is in the best condition for gameplay and reduces the risk of injury. It is also recommended to check the pressure periodically during gameplay, especially in extreme weather conditions where the pressure may fluctuate more rapidly.

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