Which of the following is an everyday example of a lever?

A seesaw is a classic example of a lever because it consists of a long beam that pivots around a central fulcrum. When one person sits on one end of the seesaw and pushes down, their weight causes the other end to rise, demonstrating how levers amplify force. The design of a seesaw illustrates the fundamental principles of levers: we can move a load with less effort by changing the position of the fulcrum or by adjusting where the load and effort are applied along the beam.

In contrast, a ramp functions as an inclined plane, allowing for the easier movement of objects upward without the characteristics of a lever, which involves a pivot point. A wheelbarrow is a combination of lever and wheel, where the wheel acts as the fulcrum and the effort is applied at the handles, but it is more complex than a straightforward lever. Finally, a screw is a type of simple machine that converts rotational motion into linear motion, but it does not operate according to the principles of a lever. Thus, the seesaw epitomizes the simplicity and effectiveness of levers in everyday life.