Of all the options given, the simple machine that offers a mechanical advantage of exactly 1 is the:

Of all the options given, the simple machine

Multiple choice — select the best answer

ASecond-class lever.
BScrew.
CSingle movable pulley.
DSingle fixed pulley.

✓ Correct answer: D. Single fixed pulley. A single fixed pulley is a simple machine that offers a mechanical advantage of exactly 1. This means that the input force and the output force are the same. The pulley does not multiply or change the force applied to it. It only changes the direction of the force.

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