Code Number: 1L20.25

Demo Title: String Unwinding From a Pole - Relaxation Oscillator

Condition: Excellent

Principle: Orbits

Area of Study: Mechanics

Equipment:

String and Pole Toy.

Procedure:

Replace the rubber bands of the toy with new #32 rubber bands before use. Wind the toy about 30 times and then release the rotating arm. The arm will rotate and then the bead on the string will wind itself around the pole. When the string unwinds, the arm will rotate another turn and the bead winding and unwinding will repeat.

References:

Robert Ehrlich, "4.13 - String Unwinding From a Pole", Why Toast Lands Jelly-Side Down, p. 78

1L20.25 - String Unwinding From a Pole Toy - Relaxation Oscillator

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.

Instructional Resources and Lecture Demonstrations

1L20.25 - String Unwinding From a Pole - Relaxation Oscillator

Disclaimer