Define angular momentum. Give its mathematical expression and SI unit.

Explanation

It is the moment of momentum about an axis of rotation.
Angular momentum = linear momentum `xx` perpendicular distance from axis of rotation
or `vecL= vecr xxvecp` where `vecp = mvecv` = linear momentum of the body
The magnitude of angular momentum is given by
`L=rp sin theta = mvr sintheta`
SI unit of angular momentum is `kg m^2s^(-1)`