Theory of Machine
Which of the following is an example of sliding pair?

Piston and cylinder of a reciprocating steam engine
Lead screw of a lathe with nut
Ball and a socket joint
Shaft with collars at both ends fitted into a circular hole

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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.
The friction force is independent of me area of contact.
All of these

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