Question
Tue October 16, 2012 By:
 

what is coefficient of restitution and how do we calculate it?

Expert Reply
Wed October 17, 2012
The coefficient of restitution is the ratio of speeds of a falling object, from when it hits a given surface to when it leaves the surface. In laymen's terms, the coefficient of restitution is a measure of bounciness. 

The coefficient of restitution is found by the formula

Coefficient of Restitution = speed up / speed down.

If a ball is made to fall from a particular height then, measure the height from where is falls (H) and measure the height upto which it bounce (h) and put it in the formula

v = ?(2gh)

Where v = velocity, g = 9.8m/s2, and h = average height measured (if experiment is repeated for few observations, then take average)

We took the average of the bounced height value (h) and put it in the formula along with the initial height (H).

Coefficient of Restitution = ?(2gh)) / ?(2gH) = ?(h/H)


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