Theory of Machine
Hammer blow

Varies as the square root of the speed
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.

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Theory of Machine
Kinematic pairs are those which have

Surface contact between the two elements when in motion
Two elements that permit relative motion
Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion

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Theory of Machine
In a single slider crank chain

Two are turning pairs and two are sliding pairs
Three are turning pairs and one is a sliding pair
One is a turning pair and three are sliding pairs
Each of the four pairs is a turning pair

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