Mb-5 Happy and Unhappy Balls

Aim

To demonstrate the difference of coefficient of restitution of two balls that appear to be quite similar.

Apparatus

  • Happy and unhappy balls

Happy and Unhappy Balls

Happy and Unhappy Balls

Description

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.

Video