Angular Momentum - 2


Angular momentum = (rotational mass) x (angular velocity)

L = I

The angular velocity and the angular momentum L are both vectors! The vector lies along the axis of rotation and points toward one end or the other according to the "right hand rule":

Rght Hand Rule

Just as we wrote

for the linear case, we can also write

for the rotational equivalent.

Remember, torque is a vector. When we wrote


r and F are vectors and their "cross product" or "vector product" is also a vector!

Ang Mom 1

Rotational Force
Return to ToC, Rotational Motion
(c) 2002, Doug Davis; all rights reserved