Theory of Machine
The swaying couple is due to the

Partial balancing
Two cylinders of locomotive
Primary unbalanced force
Secondary unbalanced force

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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
Is the maximum horizontal unbalanced force caused by the mass provided 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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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Tension in the slack side of the belt
Average tension of the tight side and slack side of the belt
Tension in the tight side of the belt
Sum of the tensions on the tight side and slack side of the belt

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