Applied Mechanics and Graphic Statics
Free body diagram is an

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

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Angle between normal reaction and resultant of normal reaction and limiting friction
Friction force acting when the body is just about to move
Friction force acting when the body is in motion
Ratio of limiting friction and normal reaction

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