Applied Mechanics and Graphic Statics
If a set of given forces are such that their free vectors build a closed polygon, then

The resultant force and resultant couple are always zero
The resultant force is zero but resultant couple may not be zero
The resultant force and resultant couple both may not be zero
The resultant force is zero but resultant couple is not zero

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Applied Mechanics and Graphic Statics
The maximum displacement of a particle executing S.H.M. corresponds to

Maximum kinetic energy and maximum potential energy
Zero potential energy and maximum kinetic energy
Minimum kinetic energy and minimum potential energy
Zero kinetic energy and maximum potential energy

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Applied Mechanics and Graphic Statics
Newton’s Law of Motion is:

All listed here
To every action, there is always an equal and opposite reaction
Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

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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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