Applied Mechanics and Graphic Statics
Free body diagram is an

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

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Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

On any point on the line of action of the force
At the centre of gravity of the body
At any point on the surface normal to the line of action of the force
On the periphery of the body

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