1Q60.36 - Spinning Eggs

Code Number:
Demo Title:
Spinning Eggs
Torque & Stable Axis
Area of Study:
Paraffin and water filled plastic eggs.

The green egg is the paraffin filled one.  The yellow and pink eggs have water in them of different amounts.

When spun the paraffin filled egg will spin very well and may even turn so that it spins on its end.  The water filled egg will not spin easily.  Also, if you spin the water filled egg rapidly, and then stop it and quickly release it, it will start to spin again because the water had not stopped rotating.

Spin the egg so that it spins in an upright orientation.  Then pick up the plate and by tilting and rotating the plate you can keep the egg spinning indefinitely.

  • Kenneth Brecher and Rod Cross, "Physics of the PhiTOP®", TPT, Vol. 57, #2, Feb. 2019, p. 74.
  • Rod Cross, "Surprising Behavior of Spinning Tops and Eggs on an Inclined Plane", TPT, Vol. 54, #1, Jan. 2016, p. 28.
  • Martin Gardner, "Rotating Egg", TPT, Vol. 32, #3, Mar. 1994, p. 189.
  • H. Richard Crane, "On Electric Shocks and Spinning Eggs", TPT, Vol. 27, #4, Apr. 1989, p. 300.
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  • Jerry D. Wilson, "A Simple Demonstration for Physics and Physical Science", TPT, Vol. 9, #5, May 1971, p. 262.
  • Ken Sasaki, "Spinning Eggs - Which End Will Rise?", AJP, Vol. 72, #6, June 2004, p. 775.
  • Gustavo Gutierrez, Carlos Fehr, Andrea Calzadilla, and Douglas Figueroa, "Fluid Flow Up the Wall of a Spinning Egg", AJP, Vol. 66, #5, May 1998, p. 442.
  • M-646, "Raw vs. Hard-Boiled Egg", DICK and RAE Physics Demo Notebook.
  • Martin Gardner, "Rotating Egg", Science Tricks, p. 40.
  • Martin Gardner, "The Egg and I-Nertia", Entertaining Science Experiments with Everyday Objects, p. 126.
  • Vicki Cobb and Kathy Darling, "A Raw Deal", Bet You Can't!, p. 41.
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  • Arthur L. Lutz, "Spinning Eggs", American Scientist, Volume 71, November-December 1983, p. 572.
  • "The Spinning Egg", The Boy Magician, ISBN 978-1-58816-754-5, p. 77.
  • Jearl Walker, "2.28, Water Climbing a Spinning Egg", The Flying Circus of Physics Ed. 2, p. 94.
  • Jearl Walker, "1.107, Spinning Eggs", The Flying Circus of Physics Ed. 2, p. 53.
  • Tom Senior, "Spinning Tops......Eggs!".
  • Tik L. Liem, "Stand A Raw Egg On Its Head", Invitations to Science Inquiry - Supplement to 1st and 2nd Ed. p. 107.
  • Julius Sumner Miller, Q31 & A31, Millergrams I – Some Enchanting Questions for Enquiring Minds, p. 29 & 87.

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