Theory of Machine
Flexible coupling is used because

It is easy to engage and disengage
It is easy to disassemble
It prevents shock transmission and eliminates stress reversals
It transmits shocks gradually

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Theory of Machine
The direction of Coriolis component of acceleration is the direction

Along perpendicular to angular velocity
Along tangential acceleration
Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
Along the centripetal acceleration

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