Theory of Machine
Torsional vibrations are said to occur when the particles of a body moves

Parallel to its axis
In a circle about its axis
None of these
Perpendicular to its axis

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is dependent on the materials of the contact surfaces.
The friction force is directly proportional to the normal force.
All of these
The friction force is independent of me area of contact.

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