Theory of Machine
When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a

Spherical pair
Sliding pair
Screw pair
Turning pair

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

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

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