Theory of Machine
Two systems shall be dynamically equivalent when

G. of two coincides
M.I. of two about an axis through e.g. is equal
The mass of two are same
All of these

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Theory of Machine
Open 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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