A lever has a total length of 12 meters with a fulcrum at the exact center of the lever. Which best describes how to double the mechanical advantage of the lever?

Mechanical advantage is the effort arm divided by the resistance arm. With the fulcrum at the center, both arms are 6 meters, so the mechanical advantage is 6/6 = 1. Moving the fulcrum 2 meters away from the side where force is applied makes the effort arm 8 meters and the resistance arm 4 meters, giving 8/4 = 2; moving it toward the force side would reduce the mechanical advantage.

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