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 the periphery of the body
On any point on the line of action of the force

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A satellite encircling the earth
A uniform solid cone resting on its base on a horizontal plane
A uniform solid cone resting on a generator on a smooth horizontal plane
A solid cube resting on one edge

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