Lecture Demos: 1Q40.42

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Moment of Inertia

Moment of Inertia

The moment of inertia of a roto-dyne wheel increases as the radial masses are added and moved outward radially. Assuming that the radial masses are point masses added at a distance (r) from the center of rotation, the increase in moment of inertia is expected to be:

I = I 0 + Mr 2

where M is the total mass added (4X 225g) and r is the radial distance at which it is added and Io is original moment of inertia.

PIRA Code(s): 
1Q40.42
Set up time: 
1 minute
Physics and Science Concepts: 
Moment of Inertia, Mechanics
Operation: 
Instructions included in box. Must obtain ring stand and clamp from 9C40.71 and 9C40.72, respectively. A known weight attached to a string around the wheel torques the wheel a constant amount.
Safety: 
Use caution around spinning wheel.

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