The measure of the quantity of motion possessed by a body in rotational motion is called angular momentum.

**Definition**

The angular momentum of a body about an axis is the product of its linear momentum and the perpendicular distance of the body from the axis.

In other words

The angular momentum of a body is equal to cross product of its

linear momentum and the vector distance from the axis of rotation.

**Mathematical representation**

If a body of mass “m” is moving in a circle or radius

with velocity

the linear momentum of body

is the angular momentum of the body is given by:

**Magnitude of Angular momentum**

We know that m r2 is equal to moment of inertia i.e. I = m r2

Thus,

**Unit of angular momentum**

In S.I. System unit of angular momentum is "joule.second".

**Dimension of angular momentum**

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