How is the force needed to maintain an object’s motion affected by its mass?

• A. A lower mass requires less force to maintain motion
• B. Mass does not affect force needed for motion
• C. A higher mass requires significantly more force to maintain motion
• D. Force is solely determined by speed, not mass

Answer: (C)

The correct choice emphasizes the relationship between mass and the amount of force required to maintain an object's motion as described by Newton's second law of motion. This law states that the force acting on an object is equal to the mass of that object multiplied by its acceleration (F = ma). Therefore, as an object's mass increases, the amount of force needed to achieve the same acceleration also increases.

In practical terms, if two objects are moving at the same speed but one has a greater mass, more force will be necessary to keep that heavier object moving at that speed. This is because the inertia of the heavier object resists changes to its motion more than that of a lighter object. Thus, a higher mass does result in a significantly greater requirement for force to maintain motion, affirming the correctness of the selected answer.

The other choices do not accurately capture this fundamental principle of physics. For instance, the option that states a lower mass requires less force reflects the inverse relationship correctly, but it does not address how mass fundamentally impacts force needs. The claim that mass does not affect force ignores the pivotal role mass plays in determining the necessary force for acceleration. Additionally, the assertion that force is solely determined by speed overlooks the critical influence of mass in motion dynamics.