# Formula Rigid body Rotational energy    Angular velocity    Moment of inertia

## Rotational energy

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

## Angular velocity

Unit
The angular velocity indicates the angle traveled per time.

## Moment of inertia

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