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The Torsion Wheel
hobby tools | item number: TOOL100DF

The Torsion Wheel

Online Price: $29.95

Availability: This item is currently in stock

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This is the only tool of it kind in the world! Designed by Doc FIzzix to accurately find a mousetrap's spring constant. Once you know the spring constant you can also calculate a mousetrap's starting potential energy, efficiency, power output, work, friction, and so much more. Student can compare their vehicle starting energy with others in order to make prediction about their vehicles performance. Lab activities are included.


  • easy to use
  • accurately find starting energy
  • Perfect for all vehicle projects
  • Everything you need in one package
The Torsion Wheel is designed to work with any mousetrap and is made from durable acrylic plastic. The Torsion Wheel comes with a full life time guarantee, if the Torsion Wheel ever breaks or fails just send it back for a free replacement. You will need your own spring scale with a rang from 0- 5 newtons and a c-clamp, the Torsion Wheels will also works with a force probe hooked up to a computer.

How it works:

A string attached at the bottom of a disk and fitted into a groove along the top is pulled downward with a force probe or a spring scale. The student records the pulling force for every five-degree increment marked on the disk. The direction of the force does not change, so the scale does not need to be zeroed at different positions. The Torsion Wheel is made of durable, high quality plastic. Lab activities are included.

Activities files:

Includes the following:

  • Torsion Wheel
  • Lab activities guide

Tools required:

  • force probe or spring scale
  • large C-clamp
  • mousetrap
Size : axle length = 6 inches, wheel diameter = 4 3/4-inchs.

Weight : 2.1 oz.

mouse trap car mouse trap car mouse trap car *Kits require assembly, actual results will vary, glue and tools not included.

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Doc Fizzix Products, P.O. Box 5507, Round Rock TX 78683, U.S.A.