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I know that gravity is able to exert a force, or torque by acting on the center of mass, causing an object to rotate. But what about rolling motion? Where would the axis of rotation be for a ball rolling down an incline?

Also, in terms of gravity, what does it mean for a ball to have a large/small moment of inertia and torque. Does this show anything about the effects of gravity on balls that have large/small moments of inertia and torque?

Relevant equations:

T=Ia

Tgrav=-mgx(cm)