What type of lever has the fulcrum placed between the effort and the load?

A lever with the fulcrum positioned between the effort and the load is classified as a Class One lever. In this configuration, the effort applied on one side of the fulcrum is used to lift the load on the other side. This arrangement allows for a balance of forces, and as a result, the required effort can be less than the weight of the load, thereby providing a mechanical advantage. Common examples of Class One levers include a seesaw or a pair of scissors, where the fulcrum is located at the center, enabling the opposing forces to work together effectively.

Other classes of levers differ in the arrangement of the fulcrum, effort, and load. For example, in Class Two levers, the load is situated between the effort and the fulcrum, and in Class Three levers, the effort is applied between the load and the fulcrum. This unique positioning of the fulcrum in Class One levers is what defines their specific mechanical advantages and functional applications.