Theory of Machine
Which of the following is a lower pair?

Ball and socket i
Piston and cylinder
Cam and follower
Both (A) and (B) above

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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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