Theory of Machine
Rectangular bar in a rectangular hole is the following type of pair

Completely constrained motion
Partially constrained motion
Freely constrained motion
Incompletely constrained motion

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Theory of Machine
Hammer blow

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

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