1R40.30 - Dead and Alive Balls




Code: 1R40.30


Demo Title: Dead and Alive Balls


Subject: Coefficient of Restitution


Description:
This demo shows the effect of elasticity or modulus of restitution on an elastic collision. Specifically, two physically identical balls but with different elasticities are dropped onto a hard surface. One bounces and the other does not.


Procedure:

  • First, show that the two balls have the same size, shape and density.
  • Drop the two balls from the same height, and observe the result of each ball's collision with the hard ground.
  • Explain why one bounces and the other does not.

  • Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with Rutgers University and only under the direction of a trained instructor or physicist. Rutgers University is not responsible for any demonstrations performed by those using their own or others equipment, or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here, entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition, and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.


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