Applied Mechanics and Graphic Statics
One end of an elastic string of natural length ‘l’ 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 rectilinear motion with constant speed
None of these
A simple harmonic motion

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Applied Mechanics and Graphic Statics
Periodic time of body moving with simple harmonic motion, is

Directly proportional to its angular velocity
Directly proportional to the square of its angular velocity
Inversely proportional to the square of its angular velocity
Inversely proportional to its angular velocity

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Applied Mechanics and Graphic Statics
The angle of friction is:

The ratio of the friction and the normal reaction
The angle between the normal reaction and the resultant of normal reaction and limiting friction
The force of friction when the body is in motion
The force of friction at which the body is just about to move

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