Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

At 45° to the link joining the points
Parallel to the link joining the points
Perpendicular to the link joining the points
None of the listed here

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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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