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

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

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

All (A), (B) and (C)
Algebraic sum of vertical components of all the forces must be zero
Algebraic sum of horizontal components of all the forces must be zero
Algebraic sum of the moments of the forces about a point must be zero

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