Angular impulse
= Angular impulse
{title2=$\mathbf J_L=\int\boldsymbol\tau\,dt=\Delta\mathbf L$}
The <time integral> of <torque> about a specified origin equals the change in <angular momentum> about that origin under the usual fixed-origin <inertial frame> balance. Its units are $\mathrm{N\,m\,s}$, equivalently $\mathrm{kg\,m^2\,s^{-1}}$. For rotation about a fixed <principal axis>, the magnitude is $I\Delta\omega$.