Does Gravity Have Torque at the Pivot Point?

[auk411]

Homework Statement

here is an image: http://panda.unm.edu/Courses/Price/Phys160/F29-4.jpeg

Homework Equations

The Attempt at a Solution

My pivot point is at the roller. Doesn't that mean that gravity has no torque?

 

[ehild]

My pivot point is at the roller. Doesn't that mean that gravity has no torque?

It is only true if h=(L/2) sin(theta)


ehild