SCE Groundman Practice Exam

What does mechanical advantage describe?

The ratio of the output force to the input force The energy efficiency of a machine The speed of movement The amount of friction in a system

Correct Answer:

The ratio of the output force to the input force

Explanation:

Mechanical advantage tells you how much a machine multiplies the input force. It is the ratio of the output force to the input force. For example, if you push with 20 N and the machine lifts with 100 N, the mechanical advantage is 5. This concept explains why machines let you move heavy loads with less effort. It’s not a measure of energy efficiency (that’s about work in versus work out and losses to friction), and it isn’t a measure of speed or distance moved. Real machines also have friction that reduces the actual advantage below the ideal calculation. Different machines show MA in different ways (for a lever, MA = effort arm length / load arm length; for an inclined plane, MA = length/height; for pulleys, MA equals the number of supporting rope segments).

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