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Physics
Classical Physics
Mechanics
About which axis the moment of inertia of A body is minimum
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[QUOTE="Ibix, post: 5570678, member: 365269"] You can treat a body as if it were a point particle of the same mass located at the centre of mass for some purposes. Not all, and rotation is not one if those purposes, since how hard something is to start rotating depends on the mass distribution. The parallel axis theorem is the rigorous answer to your question - take a look at the derivation in the wiki link. Intuitively, the centre of mass is the place where the average distance to all the little elements of mass making up the body is minimised. If one tries to rotate about an axis that does not pass through the center of mass then the average distance to all the little bits of mass is increased. So the ##mr^2## is increased because the ##r^2## increase, not because the m changes. And the total ##mr^2## is just the moment of inertia. [/QUOTE]
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Physics
Classical Physics
Mechanics
About which axis the moment of inertia of A body is minimum
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