Theory of Machine
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ω² R cosθ
ω² (R - r₁) sinθ
ω² r₁ sinθ
ω² (R - r₁) cosθ

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Theory of Machine
In gears, interference takes place when

Gears do not move smoothly in the absence of lubrication
Pitch of the gears is not same
Gear teeth are undercut
The tip of a tooth of a mating gear digs into the portion between base and root circles

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