In a Class I lever, what is the correct arrangement of elements?

In a Class I lever, the correct arrangement of elements is that the fulcrum is positioned between the weight (load) and the force (effort) applied. This configuration allows the lever to amplify the force applied, enabling greater load movement with less effort.

In this arrangement, when force is applied on one side of the lever arm, the lever pivots around the fulcrum, and the weight, positioned on the opposite side, is lifted. This setup is commonly seen in devices such as seesaws and crowbars, where balancing the load against the applied force is essential.

Understanding this configuration is crucial in rescue operations, particularly when utilizing levers to lift or reposition heavy materials during extrication scenarios. Recognizing how the fulcrum, weight, and applied force interact helps rescuers make informed decisions about equipment and techniques to effectively manage difficult extrication situations.