Theory of Machine
Kinematic pairs are those which have two elements that

Permit relative motion
Are held together
Have line contact
Have surface contact

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Theory of Machine
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with decreasing amplitude
Oscillate with increasing time period
Return to equilibrium position without oscillation
Oscillate with constant amplitude

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