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

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

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Theory of Machine
For dynamic balancing of a shaft

Both (A) and (B)
The net couple due to the dynamic forces acting on the shaft is equal to zero
The net dynamic force acting on the shaft is equal to zero
None of these

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