Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force and resultant couple are both equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant couple is equal to zero
Resultant force is equal to zero

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Theory of Machine
Inertia force acts

Perpendicular to the acceleration force
None of the listed here
Along the direction of acceleration force
Opposite to the direction of acceleration force

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