what is coefficient of restitution what is it's significience
Answers
Well, "restitution" is what you give back. And "coefficient" means a single number that describes how much. Got it?
The coefficient of restitution is a number which indicates how much kinetic energy (energy of motion) remains after a collision of two objects.
If the coefficient is high (very close to 1.00) it means that very little kinetic energy was lost during the collision. If the coefficient is low (close to zero) it suggests that a large fraction of the kinetic energy was converted into heat or was otherwise absorbed through deformation. Let's take a closer look:
When a moving object (say a rubber ball) collides with an immobile flat surface (say a massive marble floor), the object will rebound with some fraction of its original energy. If the collision is perfectly elastic, then the ball will rebound with all of the energy it arrived with and its rebound velocity will be the same as its approach velocity. In this case, the coefficient of restitution is said to be precisely 1.00. On the other hand, if there is considerable permanent deformation of either the object or the surface (or both) then the object will rebound with much less energy than it originally arrived with. In this case, the coefficient of restitution will be close to zero.
In the latter case, the surface was probably soft or otherwise absorptive. In the first case, the surface might have been particularly hard... or it may have been particularly springy.
And this is where the coefficient of restitution becomes important in golf.
We won't bore you with explanations of momentum, but the example above would have also worked with an initially motionless object (say, a teed up golf ball) being struck by a moving surface (the face of a driver).
There is nothing magic about this number called the coefficient of restitution. It doesn't make one driver any better or worse than another any more than a speedometer can make its car go faster or slower than another. The speedometer merely tells you how fast the particular car is going. And the coefficient of restitution merely tells you how much of the original kinetic energy remains after a collision of the clubhead with the golf ball.
The higher the coefficient of restitution, the faster the ball will be propelled by the clubhead for a given impact speed.
So why all the fuss over this figure?
It's because the USGA is trying its best to limit the influence of technology in golf. Theory being that golf should challenge the skill and savvy of the individual rather than the technology in his or her bag. And this is probably a good thing for the sport. After all, it would be very effective to go bass fishing by dropping depth charges over the side of your boat. Just scoop 'em up when they float to the surface. But would that really be bass fishing?
So the USGA has adopted limits of 0.830 on the coefficient of restitution a given clubface may have as part of its effort to define the boundaries of technology in the game.
Answer:
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