Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Force-closed pair
Lower pair
Higher pair
Self-closed pair

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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
Ratio of the mean resisting torque to the work-done per cycle
Difference between the maximum and minimum energies
Sum of the maximum and minimum energies

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