torque definition

Question

Torque magnitude produced by force F at perpendicular distance r is:

RankGuru · Accepted Answer

Torque ($\vec{	au}$), or the moment of a force, is the tendency of a force to rotate a body about an axis. 
$\vec{	au} = \vec{r} 	imes \vec{F}$
The magnitude is given by:
$	au = r F \sin 	heta$
When the force is applied at a **perpendicular distance** ($r_{perp} = r$), the angle $	heta = 90^\circ$ and $\sin 90^\circ = 1$. 
Thus, $	au = r F$.

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torque definition

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