Do these two force diagrams have the same torque?

NoobeAtPhysics · Nov 7, 2013

Homework Statement

Do both these two pictures have the same moments?

Diagram of a uniform rod of length L with a pivot point labelled A at its left end, and a force F applied at the right end at 30 degrees below the horizontal.

Diagram of a horizontal rod of length L with a pivot point labelled A at its left end, and a force F applied at its right end at 30 degrees below the horizontal.

Homework Equations

t=rF

The Attempt at a Solution

Yes, if you use the formula, you will notice they have the same moments and direction (using right hand) . Is this correct?

Doc Al · Nov 7, 2013

NoobeAtPhysics said:

Yes, if you use the formula, you will notice they have the same moments and direction (using right hand) . Is this correct?

Yep. Only the component of force perpendicular to the length L contributes to the torque about point A. The perpendicular component is the same in both cases.

NoobeAtPhysics · Nov 7, 2013

thank you doc AI san

Do these two force diagrams have the same torque?

Homework Statement

Homework Equations

The Attempt at a Solution

Discussion

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