Which statement best describes static versus dynamic balancing?

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Static balancing makes sure the mass is distributed so the rotor sits without tipping when it’s at rest. Dynamic balancing then ensures the mass distribution remains even as the rotor spins, canceling out centrifugal imbalances that appear during rotation. The combination described—static balancing for rest, dynamic balancing for rotation, with the result of reduced vibration, wear, and noise—is the most complete way to address imbalance in both stationary and running conditions. Static balancing alone can leave vibration in operation, and dynamic balancing alone won’t fix issues the rotor shows when it’s still, so using both approaches provides full control over balance.