Which example illustrates a first class lever?

A first-class lever is characterized by having the fulcrum positioned between the effort applied and the load being moved. In this context, the seesaw is an excellent example because it operates on this principle: when one person applies force on one end, the opposite side lifts the load (the other person), with the pivot point (fulcrum) positioned in the middle of the seesaw.

This type of lever allows for a balance of forces, making it easy to lift weights or even out loads on either side, which is particularly effective in playground equipment or balance games. Understanding this mechanism is crucial in various applications, from simple tools to complex machinery, as it influences mechanical advantage and ease of movement.