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

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

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

All listed here
Algebraic sum of forces, constituting a couple is zero
A couple can be never the balanced by a single force
Algebraic sum of moments of forces, constituting a couple, about any point, is same

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