Applied Mechanics and Graphic Statics
A cube on a smooth horizontal surface

Can be in any of these states
Cannot be in unstable equilibrium
Cannot be in neutral equilibrium
Cannot be in stable equilibrium

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

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