Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

In plane motion which is a resultant of plane translation and rotation
Restrained to rotate while sliding over another body
In plane translation with variable velocity
In plane rotation with variable velocity

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Theory of Machine
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Effects of unbalances are proportional to the square of the speed
Unbalanced couples are caused only at higher speeds
Effects of unbalances are directly proportional to the speed
Unbalanced forces are not dangerous at higher speeds

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