# Rotational Kinetic Energy | Definition, Formula, Units – Rotational Motion

Rotational Kinetic Energy Definition:
Rotational kinetic energy of a body is equal to the sum of kinetic energies.

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## Rotational Kinetic Energy | Definition, Formula, Units – Rotational Motion

Rotational energy occurs due to the object’s rotation and is a part of its total kinetic energy. If the rotational energy is considered separately across an object’s axis of rotation, the moment of inertia is observed.

Rotational Kinetic Energy Formula:
Rotational kinetic energy,

K = $$\frac{1}{2}$$ Iω²

Where,
K is Rotational Kinetic energy
I is the moment of inertia
ω is the angular velocity

Rotational Kinetic Energy Unit:
SI unit for rotational kinetic energy is the joule (J)

Rotational Motion:
In this portion, we will learn about the rotational motion of the objects. A body moves completely in rotational motion when each particle of the body moves in a circle about a single line. When a force is applied on a body about an axis it causes a rotational motion. The force applied here is called the torque. The axis of the rotation usually goes through the body. Also, learn the two theorems such as parallel axes and perpendicular theorem explained with respect to rotational motion of objects.