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Formula Rigid body Rotational energy    Angular velocity    Moment of inertia

Formula: Rigid body
Angular Momentum and Angular Velocity of a Disk

Rotational energy

The rotational energy is the part of the energy that a rigid (non-deformable) body has when it rotates around an axis.

Angular velocity

The angular velocity indicates the angle traveled per time.

Moment of inertia

Moment of inertia depends on the mass and distance from the axis of rotation and acts like a resistance to rotation.