Define Force in a system of particles about point P

[xzibition8612]

Homework Statement

Define Force in a system of particles about point P

Homework Equations

The Attempt at a Solution

I know force can be explained but not defined. However, i don't think you can just say the force is a push or a pull in a "system of particles about point P". Can somebody help me with this thanks.

 

[mfb]

If this is the full problem statement in the original language, I have no idea what it means.