Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

Restrained to rotate while sliding over another body
In plane translation with variable velocity
In plane motion which is a resultant of plane translation and rotation
In plane rotation with variable velocity

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Theory of Machine
Lower pairs are those which have

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

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Theory of Machine
The contact ratio is given by

(Length of path of recess)/(Circular pitch)
(Length of the arc of contact)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of the path of approach)/(Circular pitch)

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