Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

In plane motion which is a resultant of plane translation and rotation
In plane rotation with variable velocity
In plane translation with variable velocity
Restrained to rotate while sliding over another body

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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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