Torque and Angular Momentum
The rotational equivalents of force and linear momentum.
Torque
Torque (or moment of a force) measures the turning effect of a force about a point or axis.
τ = r × F
Angular Momentum
Just as linear momentum is conserved in the absence of external force, angular momentum is conserved in the absence of external torque — this is the law of conservation of angular momentum.
Lesson 14 of 31