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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 don't produce a torque.

I don't 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 don't 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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