To demonstrate the difference of coefficient of restitution of two balls that appear to be quite similar.
- Happy and unhappy balls
Happy and Unhappy Balls
By holding the two balls at the same height, and releasing them, one will bounce back to a similar height of release, while the other ball will hardly bounce at all. The happy ball, the one with greater bounce, has a high coefficient of restitution. The unhappy ball has a low coefficient of restitution, thus absorbing most of the energy of the fall.