What are the three basic parts of a lever?

The three basic parts of a lever are the fulcrum, force (or effort), and resistance.

The fulcrum is the pivot point around which the lever rotates. It serves as the axis of movement and is crucial in determining how the lever functions. The force or effort is the input applied to the lever in order to move the load, while resistance refers to the load or weight being lifted. Understanding how these three components interact is essential for leveraging mechanical advantage in various applications, whether in aviation maintenance or in general mechanics.

This combination of fulcrum, effort, and resistance clearly outlines the fundamental roles that each part plays in the operation of a lever, thus reinforcing why this answer is the correct choice.