Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

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

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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

On the periphery of the body
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

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