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 always acts in a direction opposite to that in which the body tends to move
The force of friction is dependent upon the area of contact

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with only body forces acting on it
Isolated joint with all the forces, internal as well as external, acting on it
None of these
Isolated joint with internal forces acting on it

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