Angular Momentum and Torque Problemo

[Skoob]

Homework Statement

Consider two forces F and -F that act at different points on an extended object. Show that the net force of this combination is zero and that the torque about any point P is independent of the location of P, and depends only on the separation of the two points at which the forces act.

Homework Equations

So this basically revolves around the concept of equilibrium.

The Attempt at a Solution

 

[SteamKing]

Homework Statement

Consider two forces F and -F that act at different points on an extended object. Show that the net force of this combination is zero and that the torque about any point P is independent of the location of P, and depends only on the separation of the two points at which the forces act.

Homework Equations

So this basically revolves around the concept of equilibrium.

The Attempt at a Solution

Skoob, you're new to PF. PF Rules require that you fill out all three parts of the HW Template when you post a thread so you can get help. Merely typing in the question without showing an attempt at solution just wastes your time and doesn't lead to anything productive. PF is not a HW service.

 

[Herman Trivilino]

So this basically revolves around the concept of equilibrium.

It's about a force couple.

 

[higg's bosom]

is it because the forces are equal in magnitude and opposite directions so the net force is zero??

 

[haruspex]

depends only on the separation of the two points at which the forces act.

That is wrongly worded. It should say "depends only on the separation of the lines of action of the two forces". That is, it is not whole the separation of the two points, only the component of that separation that is at right angles to the two forces.

 

[Herman Trivilino]

That is wrongly worded. It should say "depends only on the separation of the lines of action of the two forces". That is, it is not whole the separation of the two points, only the component of that separation that is at right angles to the two forces.

And on the magnitude of F.

 

[haruspex]

And on the magnitude of F.

Yes, but I let that pass since F is clearly given as an input.