Applied Mechanics and Graphic Statics
For a non-concurrent force system to be in equilibrium

Only the closure of funicular polygon is sufficient
Only the closure of force polygon is sufficient
Both force polygon and funicular polygon must close
None of these

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

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