Angular momentum

The angular momentum or rotational momentum (L) of an object rotating about an axis is the product of its moment of inertia and its angular velocity:

${\displaystyle L=I\omega }$

where

${\displaystyle I}$ is the moment of inertia (resistance to angular acceleration or deceleration, equal to the product of the mass and the square of its radius measured perpendicularly from the axis of rotation);

${\displaystyle \omega \ }$ is the angular velocity.

There are three kinds of angular momentum: the vibrational angular momentum, the spin angular momentum and the orbital angular momentum.