Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Force-closed pair
Lower pair
Self-closed pair
Higher pair

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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 rotation with variable velocity
In plane motion which is a resultant of plane translation and rotation
In plane translation with variable velocity

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