Theory of Machine
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Magnification factor
Damping factor
Damping coefficient
Logarithmic decrement

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Theory of Machine
Lower pairs are those which have

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

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