Mechanical Advantage: Definition.

• A. The energy stored in a system.
• B. When a machine increases the magnitude of output force with a small input force.
• C. The ratio of distance moved to work done.
• D. The speed at which a machine operates.

Answer: (B)

Mechanical advantage is about how much a machine multiplies your effort to produce a larger output force. It tells you how much bigger the force on the load is compared to the force you apply. The statement that describes this is that a machine increases the magnitude of the output force with a small input force, meaning a small push or pull can move a heavier load because the machine is amplifying the force you provide. That’s why this option best captures the idea of mechanical advantage.

Think of a lever or a pulley: by adjusting the setup, you can lift a heavy object with less input force because the machine transfers and multiplies that force. In real life, friction means you won’t get perfect amplification, but the core concept remains—the output force is greater than the input force.

The other ideas don’t describe mechanical advantage. Energy stored refers to potential energy, not force amplification. The ratio of distance moved to work done isn’t the definition of mechanical advantage (work and distance relate to energy transfer, not directly to how much the force is amplified). And speed describes how fast the machine operates, not how it multiplies force.