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1Q40.u1 - Conservation of Angular Momentum Model

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​1Q40.u1 - Conservation of Angular Momentum Model

Title1Q40.u1 - Conservation of Angular Momentum Model

This demonstration shows that when the effective radius of a rotating system is reduced, the angular speed increases to conserve angular momentum.

Assembly Instructions

Clamp the base of the apparatus to the corner of a table.  Ensure that the string that feeds to the handles is free moving with no erronious knots in the string.

Setup Time10
Operation Time
Preview Time5
Operation Instructions

​Start the masses spinning. Then, slowly pull up on the handle, pulling the masses in and thus decreasing the moment of inertia of the system. The experiment can also be used to show that the force needed to hold the masses in place increases as they are pulled toward the center. As a result, the masses cannot be pulled all the way in until the system is slowed by friction.

Demo on DimeNo
PIRA 200No
Export Instructions (if different)
Category1 Mechanics
Subcategory1Q - Rotational Dynamics
Keywordsrotational motion
Construction Information
angular momentum model
squeezee clamp