Applied Mechanics and Graphic Statics
Force polygon method is applicable for

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

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

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