Question

students are playing on a seesaw at the playground. which simple machine are they using? inclined plane pulley screw lever

Explanation:

A seesaw is a classic example of a lever. A lever consists of a rigid bar that pivots around a fixed point called a fulcrum. In a seesaw, the board is the bar, and the middle point where it balances is the fulcrum. When one side of the bar (seesaw) is pushed down, the other side goes up, which is the basic principle of a lever. An inclined plane is a flat surface that is tilted at an angle. A pulley is a wheel with a groove that holds a rope or chain. A screw is an inclined plane wrapped around a cylinder. None of these match the structure and function of a seesaw as well as a lever does.

Answer:

lever