Torque = F*r*sin(theta)

Homework Statement

For the equation torque = F*r*sin(theta), is theta obtained from either angle:
F makes with r (or perpendicular component of F makes with r, or the perpendicular component of r makes with F)?

The Attempt at a Solution

Related Introductory Physics Homework Help News on Phys.org
djeitnstine
Gold Member
Torque can be written as $$\tau = \vec{r} \times \vec{F}$$ so one must measure the angle between r and F.

So find r then measure the angle created by F. So basically we're looking at the perpendicular component of F.
It would make no sense if it was the component of the moment arm r.

PhanthomJay