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

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

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Theory of Machine
The sense of Coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

90° in the direction of rotation of the link containing the path
45° in the direction opposite to the rotation of the link containing the path
180° in the direction opposite to the rotation of the link containing the path
45° in the direction of rotation of the link containing the path

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