temperature and golf ball collision elasticity

temperature and golf ball collision elasticity

Message Posted By: Carlos (Professional Golfers Association)
Message Posted On: April 23, 19100 at 19:15:19

In Reply To: temperature and golf ball collision elasticity
Original Message Posted By: justin kursh
Original Message Posted On: January 25, 19100 at 13:43:33:

Body of Message:
: i have recently completed the data collection phase of a science fair project in which i dropped golf balls of varying temperatures and measured the rebound height. in general, i found that the colder the ball, the less the rebound height. however, at temperatures over 100F, rebound height decreased when compared to room temperature.

: any ideas why?
Justin:

What you have encountered is called the coefficient of restitution. Simply stated, you experimented w/ the amount of energy retained by a golf ball when reacting (For every action there is an equal and opposite reaction)to being dropped.
Now assumming that you dropped identical balls (you might want to check the compressions and cover material), the golf ball reacts like a rubber gum ball almost. Of course as the ball gets warmer, the amount of elasticity increases. BUT, after a certain point the ball begins to deform, and more importantly, stick longer to the surface. This causes less and less of the energy to be released because the ball is adhering longer to the impact surface.
Again think of the rubber gum ball example. At first the temperature rising turns it from a rock to a lively ball. BUT as it becomes TOO warm, the ball turns to goop.
Hoped I explained it well enough for ya. Feel free to ask me any follow-ups.

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Comments:	: : i have recently completed the data collection phase of a science fair project in which i dropped golf balls of varying temperatures and measured the rebound height. in general, i found that the colder the ball, the less the rebound height. however, at temperatures over 100F, rebound height decreased when compared to room temperature. : : any ideas why? : Justin: : What you have encountered is called the coefficient of restitution. Simply stated, you experimented w/ the amount of energy retained by a golf ball when reacting (For every action there is an equal and opposite reaction)to being dropped. : Now assumming that you dropped identical balls (you might want to check the compressions and cover material), the golf ball reacts like a rubber gum ball almost. Of course as the ball gets warmer, the amount of elasticity increases. BUT, after a certain point the ball begins to deform, and more importantly, stick longer to the surface. This causes less and less of the energy to be released because the ball is adhering longer to the impact surface. : Again think of the rubber gum ball example. At first the temperature rising turns it from a rock to a lively ball. BUT as it becomes TOO warm, the ball turns to goop. : Hoped I explained it well enough for ya. Feel free to ask me any follow-ups.
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