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
According to Law of Triangle of Forces

Three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force
Three forces acting along the sides of a triangle are always in equilibrium
If the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third
If three forces acting on a, point can be represented in magnitude and direction, by the sides of a triangle taken in order, these will be in equilibrium

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Applied Mechanics and Graphic Statics
The following is not a law of static friction:

The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction depends upon the roughness of the surface
The force of friction is dependent upon the area of contact
The force of friction always acts in a direction opposite to that in which the body tends to move

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