What is the purpose of a fulcrum in physics?

The purpose of a fulcrum in physics is essentially to provide support for a lever. A fulcrum is the pivot point around which a lever rotates. It is essential for enabling the lever to effectively lift or move a load with less effort, depending on the position of the fulcrum relative to the load and the point where force is applied.

By positioning the fulcrum correctly, one can manipulate the lever to create mechanical advantage, which amplifies the lifting force applied. While other answers discuss aspects of lever mechanics, they focus on effects that result from the fulcrum's position rather than its primary function. The fulcrum itself is crucial because it is the support that allows the lever to operate efficiently.