How do levers help in lifting heavy objects?

Levers operate on the principle of mechanical advantage, which allows a smaller input force to lift a heavier output force. This is achieved through the lever's design and the positioning of the fulcrum, which is the pivot point of the lever. When a force is applied to one end of the lever, it creates a rotational effect around the fulcrum. If the input force is applied further from the fulcrum than the load being lifted, the lever multiplies the input force, making it easier to lift heavier objects than if the same force were applied directly.

This mechanical advantage is why levers are commonly used in various tools and machines, enabling us to lift and move heavy loads with less physical effort. By positioning the lever in such a way that the distance from the fulcrum to the input force is greater than the distance from the fulcrum to the load, the leverage provided makes lifting much more efficient.