Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Angular velocity of journal
Radius of journal
Clearance between journal and bearing
Magnitude of the forces on journal

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Theory of Machine
Kinematic pairs are those which have

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

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