Theory of Machine
In gears, interference takes place when

The tip of a tooth of a mating gear digs into the portion between base and root circles
Gear teeth are undercut
Gears do not move smoothly in the absence of lubrication
Pitch of the gears is not same

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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.
All of these
The friction force is directly proportional to the normal force.
The friction force is dependent on the materials of the contact surfaces.

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