Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Bolt and nut
Ball and socket joint
Lead screw of a lathe

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Theory of Machine
The maximum fluctuation of energy is the

Variations of energy above and below the mean resisting torque line
Sum of the maximum and minimum energies
Ratio of the mean resisting torque to the work-done per cycle
Difference between the maximum and minimum energies

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Theory of Machine
Angle of dwell 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
Of rotation of the cam for definite displacement of the follower
During which the follower returns to its initial position
Through which the cam rotates during the period in which the follower remains in the highest position

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