What is a common feature of a class 1 lever?

A class 1 lever is characterized by having the fulcrum positioned between the effort and the load. This arrangement allows for the effort applied on one side of the fulcrum to move the load on the opposite side effectively. A classic example of a class 1 lever is a seesaw, where the pivot point (fulcrum) is in the center, enabling two people on either side (the load) to lift each other when one person applies effort.

The position of the fulcrum is crucial because it affects the lever's mechanical advantage—how effectively the lever can amplify an input force to lift or move a load. By having the fulcrum located between the load and the effort, the lever can balance and transfer motion and force more efficiently. This principle is foundational in understanding lever mechanics and their applications in various practical scenarios.