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## Homework Statement:

- Find the period of a pendulum consisting of a disk of mass M and radius R fixed to the end of a rod of length l and mass m.How does the period change if the disk is mounted to the rod by a frictionless bearing so that it is perfectly free to spin?

## Relevant Equations:

- t = r*f = I*theta

If the bottom disk is free to spin, will it necessarily spin? all the forces in this disk dont produce a torque.

I dont know why we disregard it's inertia moment when it is free to spin (It's intuitively set, but I can't see it mathematically)

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I dont know why we disregard it's inertia moment when it is free to spin (It's intuitively set, but I can't see it mathematically)

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