# Point of application of force

1. Apr 19, 2011

### zorro

1. The problem statement, all variables and given/known data

Three forces are applied to a square plate of side a. The point of application (on side BC) of the resultant force is ?

3. The attempt at a solution

Resultant force acts along AC with magnitude 2F. How to find the point of application that too on a given side?

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2. Apr 19, 2011

### PhanthomJay

The resultant force does not act along a line from A to C. The resultant force is the force that is the vector sum of the individual forces, the line of action of which produces the same torque about any point as the sum of the torques of the individual forces about that point. It is often best to first break each force into its component forces.

3. Apr 19, 2011

### SammyS

Staff Emeritus
To make things easier, look at the torque about point A.

You do have the correct direction (to the right) and magnitude for the resultant force, just not the correct location.

4. Apr 20, 2011