Applied Mechanics and Graphic Statics
On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts

Downwards at its upper end
Perpendicular to the wall at its upper end
Upwards at its upper end
Zero at its upper end

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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
Inversely proportion to the distance from the point of reference
Proportional to the distance from the point of reference and directed towards it
Proportional to the square of the distance from the point of reference

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

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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
None of these
a simple harmonic motion
a damped oscillatory motion

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