Theory of Machine
The gear train usually employed in clocks is a

Differential gear
Simple gear train
Reverted gear train
Sun and planet gear

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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.
All of these
The friction force is independent of me area of contact.
The friction force is dependent on the materials of the contact surfaces.

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