Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

Just begins to slide over the surface of the other body
None of these
Is at rest
Is in motion

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Theory of Machine
Angle of action of cam is defined as the angle

Through which the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Of rotation of the cam for a definite displacement of the follower
Moved by the cam from beginning of ascent to the termination of descent

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