Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

Is at rest
None of these
Is in motion
Just begins to slide over the surface of the other body

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

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