Theory of Machine
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

Zero and maximum
Zero and minimum
Maximum and zero
Minimum and maximum

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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 independent of me area of contact.
The friction force is directly proportional to the normal force.
All of these

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