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
If a set of given forces are such that their free vectors build a closed polygon, then

The resultant force and resultant couple are always zero
The resultant force and resultant couple both may not be zero
The resultant force is zero but resultant couple may not be zero
The resultant force is zero but resultant couple is not zero

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