# Simple torque questions

1. Jul 11, 2013

### oneplusone

Hello,

[1]-Why is it that if you have a force acting upon an object at the point of the axis of torque,
you don't account it in the equation when solving for torque?

Sorry, not really sure how to word it, but ill give it another shot:

You have a long piece of wood on the ground, with many forces acting upon it. On one side of
the wood, you choose the axis of rotation. One of the forces acts on this point at a 42 degree angle.

When calculating the net torque on the object, why do you disregard that force which acts on the point?

Thanks. and let me know if i should try to reword.

2. Jul 11, 2013

### SteamKing

Staff Emeritus
Not making the connection. Perhaps a picture would help.

3. Jul 11, 2013

### PhanthomJay

Torque is calculated about a chosen point on an axis. When the force acts through that point, there is no perpendicular distance from the force to the point.

4. Jul 11, 2013

### oneplusone

Thanks, got it now!