A spinning object has angular momentum, represented by l or L.

Four fast facts about angular momentum

1. L = Iw
   
   
2. Angular momentum is a vector, pointing in the direction of the angular velocity.
   
   
3. If there is no net torque acting on a system, the system's angular momentum is conserved.
   
   
4. A net torque produces a change in angular momentum that is equal to the torque multiplied by the time interval during which the torque was applied.