How does a lever operate to lift a load?

A lever operates based on the principle of mechanical advantage, which is achieved through the use of a fulcrum. When a force is applied to one end of the lever, this lever pivots around the fulcrum, allowing the other end to lift a load. The placement of the fulcrum determines how much force is needed to lift the load. By changing the distance from the fulcrum to the point where the force is applied (the effort), you can amplify the force exerted on the load at the other end. This principle explains why levers can lift heavier loads with less effort compared to lifting them directly, making levers an essential tool for increasing efficiency in lifting tasks.