Applied Mechanics and Graphic Statics
Force polygon method is applicable for

A system of parallel forces only
Non-concurrent coplanar force system
Any coplanar force system
Concurrent coplanar force system

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Applied Mechanics and Graphic Statics
A body is said to move with Simple Harmonic Motion if its acceleration, is

Always directed away from the centre, the point of reference
Proportional to the distance from the point of reference and directed towards it
Inversely proportion to the distance from the point of reference
Proportional to the square of the distance from the point of reference

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