Central Forces - Penny & Coat Hanger


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 Code Number :   1D50.45

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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Condition :   Fair  
Principle :   Forces Due To Circular Motion  
Area of Study :  Mechanics   
Equipment :   Coat hanger bent in to a "square" form, penny or quarter.
Procedure :   Balance the penny on the end of the hook on the hanger.  Gently, rotate the hanger until you can go full circle.  Note that the penny is held onto the end of the hook by the rotational force applied.  
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   References

Dragia Trifonov Ivanov, "The Falling Card", TPT, Vol. 42, # 8, Nov. 2004, p. 502.

Martin Gardner, "Coat Hanger", TPT, Vol. 43, # 1, Jan. 2005, p. 4.

Richard A.D. Hewko,  "The Racing Car Turn,"  TPT, Vol. 26, # 7, p. 436, (October 1988).

Frank Butcher,  "Circular Motion Studies with a Toy Airplane,"  TPT, Vol. 25, # 9, p. 572, (December 1987).

Phyllis Salmons, "The Penny and the Coathanger", TPT, Vol. 15, # 1, Jan. 1977, p. 46.

John Dixon, "A Penny For Your Thoughts", TPT, Vol. 4, # 1, Jan. 1966, p. 38.

 

M- 362:  "Water in Circle-Coin on Hanger,"  DICK and RAE Physics Demo Notebook.



Mail Questions and Comments to:  Dale Stille