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

Cam and follower
Piston and cylinder
Ball and socket i
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 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.
All of these

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