What is the role of the fulcrum in a lever system?

In a lever system, the fulcrum is indeed the pivot point around which the lever rotates. This pivotal role is essential because it allows the lever to amplify the input force applied at one end to lift or move a load at the other end. By positioning the fulcrum strategically, the mechanical advantage of the lever can be maximized, allowing for heavier loads to be moved with less effort.

The distance between the load and the fulcrum, as well as the distance between the effort and the fulcrum, plays a critical role in determining how effective the lever will be in amplifying force. The ability of the lever to rotate around the fulcrum also means that a small force applied over a longer distance can lift a larger load over a shorter distance, demonstrating the fundamental principle of levers.