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First of all, for the formulas torque = r X F

If the object is being rotated around an axis parallel to the axis going throught the center of mass, what is the "r" in this case? is it the distance from the axis of rotation to the center of mass? And in what direction would the force point in this case (is it coming from the edge of the object -- say it's is cylinder -- or from the center of mass?

--> now for my question, for a disk rolling on a level ground, what would its inertia be?

if I set the fixed point where the disk is touching the ground in the initial position, would the inertial simply be 1/2MR^2 or do I have to add anything to it?

thank you

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# Simple conceptual question - rolling object question:

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