Theory of Machine
The example of completely constrained motion is a

Motion of a square bar in a square hole
Motion of a piston in the cylinder of a steam engine
All of these
Motion of a shaft with collars at each end in a circular hole

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Theory of Machine
Hammer blow

Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies inversely with the square of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies as the square root of the speed

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