Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

At 45° to line as per (A)
Joining the corresponding points
Not possible to determine with these data
Perpendicular to line as per (A)

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

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