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Moment of inertia, also called mass moment of inertia or the angular mass, (SI units kg m2, ), is the rotational analog of mass.
That is, it is the inertia of a rigid rotating body with respect to its rotation
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. For example, consider two discs (A and B) of the same mass. Disc A has a larger radius than disc B. Assuming that there is uniform thickness and mass distribution, it requires more effort to accelerate disc A (change its angular velocity) because its mass is distributed further from its axis of rotation: mass that is further out from that axis must, for a given angular velocity, move more quickly than mass closer in. In this case, disc A has a larger moment of inertia than disc B.
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