3C20.60 - Increasing Pitch - Euler's Disk, Magnets & Glass Bottles, LIGO Ring Down

Code Number:
3C20.60
Demo Title:
Increasing Pitch - Euler's Disk, Magnets & Glass Bottles, LIGO Ring Down
Condition:
Excellent
Principle:
Frequency of Sound Waves
Area of Study:
Acoustics

Disclaimer

Equipment:
Euler's Disk, Smooth Magnets, 1 gallon glass jugs.
Procedure:

The Euler's disk is very easy to use.  Spin the heavy disk ( rounded edge down ) on the slightly concave base.  If you listen carefully, you should hear the pitch of the spinning disk increasing as the disk slows down.

Separate the magnet by a distance of 1 inch in your hand.  Throw them in the air.  They will start bouncing together with a sound that increases in pitch as the bounce distance becomes smaller.

Gently touch the glass jugs together.  They will make a sound that increases in pitch as the bounce distance becomes smaller.

References:
  • W. L. Andersen, "Noncalculus Treatment of Steady-State Rolling of a Thin Disk on a Horizontal Surface", TPT, Vol. 45, #7, Oct. 2007, p. 430.
  • Russell Akridge, "Period and Amplitude", TPT, #8, Vol. 36, Nov. 1998, p. 507.
  • D. Petrie, J. L. Hunt, and C. G. Gray, "Does the Euler Disk Slip During its Motion?", AJP, Vol. 70, #10, Oct. 2002, p. 1025.
  • Lorne A. Whitehead and Frank L. Curzon, "Spinning Objects on Horizontal Planes", AJP, Vol. 51, #5, May 1983, p. 449. 
  • M. G. Olsson, "Coin Spinning On a Table", AJP, Vol. 40, #10, p. 1543, Oct. 1972.
  • Jearl Walker, "Delights of the "Wobbler," A Coin or a Cylinder that Precesses As It Spins", The Amateur Scientist, Oct. 1982.

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.