Moment of inertia

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The angular momentum of the ice skater is conserved—as she retracts her arms and legs, her moment of inertia decreases, but her angular velocity increases to compensate.

Moment of inertia (I), sometimes also called also the angular mass (kg·m2), is the inertia of a rotating body with respect to its rotation.

It is a rotating body's resistance to angular acceleration or deceleration, equal to the product of the mass and the square of its perpendicular distance from the axis of rotation.

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