Applied Mechanics and Graphic Statics
Force polygon method is applicable for

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

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Applied Mechanics and Graphic Statics
Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

The diagonal of the parallelogram which does not pass through the point of intersection of the forces
Its shorter side
The diagonal of the parallelogram which passes through the point of intersection of the forces
Its longer side

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is

a rectilinear motion with constant speed
a damped oscillatory motion
None of these
a simple harmonic motion

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