What is the definition of a third-class lever?

A third-class lever is characterized by having the effort applied between the fulcrum and the load. This configuration allows the lever to increase the speed and range of motion of the load. When the effort is applied closer to the fulcrum than the load, it requires a smaller force to move the load over a greater distance.

This type of lever is often seen in everyday examples such as a pair of tweezers or a baseball bat, where the application of force results in a greater movement at the load end, enhancing the speed and effectiveness of the motion. Third-class levers do not provide a mechanical advantage in terms of force; instead, they trade off force for movement speed and distance, which is ideal in tasks requiring agility and quick motions.

This is distinct from other types of levers, such as first-class levers, which provide a balance of force and motion, or second-class levers, which focus on maximizing force. The emphasis on speed and range of motion makes third-class levers unique in their function and application.