Theory of Machine
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

Damping factor
Critical damping ratio
Magnification factor
Logarithmic decrement

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

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