Visualize the concepts of moment of inertia of an object.
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Moment of inertia, in physics, quantitative measure of the rotational inertia of a body—i.e., the opposition that the body exhibits to having its speed of rotation about an axis altered by the application of a torque (turning force). ... The axis may be internal or external and may or may not be fixed
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Well, like mass, rotational inertia is also a scalar quantity. So it has no direction and you cannot use arrows to represent it. But it will help to think about how mass is distributed in a rotating body. If a rotating disk is more massive near its edges then intuitively you can say that its rotational inertia is higher than a disk which is more massive at the center.
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