Applied Mechanics and Graphic Statics
If the given forces P₁, P₂, P₃ and P₄ are such that the force polygon does not close, then the system will

Both (A) and (C)
Always reduce to a resultant force
Be in equilibrium
Always reduce to a couple

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Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

At the centre of gravity of the body
At any point on the surface normal to the line of action of the force
On any point on the line of action of the force
On the periphery of the body

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