Theory of Machine
The velocity of sliding of meshing gear teeth is (Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁/ω₂) y
(ω₁ × ω₂) y
(ω₁ + ω₂) y
(ω₁ + ω₂)/y

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Theory of Machine
Hammer blow

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

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