Applied Mechanics and Graphic Statics
Free body diagram is an

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

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Applied Mechanics and Graphic Statics
The angle of friction is:

The force of friction at which the body is just about to move
The force of friction when the body is in motion
The angle between the normal reaction and the resultant of normal reaction and limiting friction
The ratio of the friction and the normal reaction

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