Changes

==Proof of conservation==

==Proof of conservation==

The [[derivative]] of angular momentum with respect to time is equal to the sum of the external moments (or torque <math>\vec {\tau}</math>) applied to the system. Differentiating angular momentum gives:

The [[derivative]] of angular momentum with respect to time is equal to the sum of the external moments (or [[torque]] <math>\vec {\tau}</math>) applied to the system. Differentiating angular momentum gives:

<math>\vec {\tau} = \vec r \times \vec F + \vec{\dot{r}} \times p</math>

<math>\vec {\tau} = \vec r \times \vec F + \vec{\dot{r}} \times p</math>