Theory of Machine
In a radial cam, the follower moves

Along the cam axis
In a direction perpendicular to the cam axis
In any direction irrespective of the cam axis
In a direction parallel to the cam axis

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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 forces are not dangerous at higher speeds
Unbalanced couples are caused only at higher speeds

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