Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

Is at rest
None of these
Is in motion
Just begins to slide over the surface of the other body

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and two additional links
One lower pair and two additional links
Two lower pairs and one additional link
Any one of these

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