Theory of Machine
Hammer blow

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
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

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Theory of Machine
Oldham's coupling is the

Third inversion of double slider crank chain
Second inversion of double slider crank chain
Third inversion of slider crank chain
Second inversion of single slider crank chain

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