Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ + r₂) sinθ sec2θ
ω (r₁ r₂) sinθ
ω (r₁ r₂) cosθ
ω (r₁ + r₂) cosθ cosec2θ

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
None of these
The algebraic sum of the primary forces must be equal to zero

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