Coefficient of Restitution

IMG_0007Here we have a picture of Sheffield Wednesday enjoying a nice COR of roughly 0.8.

Hello and thanks for checking out the Sports Technology Podcast.  This week, we discuss the coefficient of restitution.  The COR is a ratio of outbound to inbound velocities that characterizes the energy loss of an impact.  It is used extensively in the sport industry to place limits on bounciness.  The number itself is a value between 0 and 1.  ‘Zero’ means all energy was lost – this is a ball dropping and sticking to the ground.  ‘One’ means the ball returned to the exact height from which it was dropped (impossible).

COR=(velocity post-impact)/(velocity pre-impact)

or

COR=sqrt((height post-impact)/(height pre-impact))

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