1001 Torque

$\begin{aligned} \tau = Fl = rF\sin \phi = F_{tan} r \end{aligned}$

$\tau$ - Magnitude of torque due to force $\vec F$ relative to point O.
$l$ - Level arm of $\vec F$.
$\phi$ - Angular between $\vec r$ and $\vec F$.
$F_{tan}$ - Tangential component of $\vec F$.
$r$ - Magnitude of $\vec r$ from O to where $\vec F$ acts.

Exercises