1R40.10 - Coefficient of Restitution

Code Number:
Demo Title:
Coefficient of Restitution
Coefficient of Restitution
Area of Study:
Telescope Mirror Blank, 1/4 Inch Diameter Ball Bearings, Steel Plate, Assorted Balls and Marbles, Clay Balls, and Happy - Sad Ball Set.

The curve of the telescope mirror blank will keep the ball from bouncing off the blank if the ball bounces somewhere near the center on the first bounce.  Use ball bearing no larger than 1/4 inch diameter or you risk damaging the glass mirror blank.  Coefficients as high as 90 percent or better may be obtained with this system.

Bounce the various balls on the steel plate and observe the coefficient of restitution.  The ball with the best coefficient should be the steel ball.

The happy - sad ball set has one ball that is much like a super ball and one ball that will absorb all of the energy and therefore will not bounce.  The bouncing ball is made from polyneoprene and the non-bouncing ball is made from polynorbornene.

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Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own 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), including 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.