Theory of Machine
The example of successfully constrained motion is a

Motion of the shaft between a footstep bearing
Motion of an I.C. engine valve
Piston reciprocating inside an engine cylinder
All of these

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

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