A seesaw is a special type of simple machine that allows people to teeter back and forth around a pivot point. Classified as a lever fulcrum, this kind of simple machine uses weight to move objects up and down around a point. This is what allows the seesaw to move effortlessly as the weight is counterbalanced evenly.
A seesaw (also known as a teeter-totter or teeterboard) is a long narrow board pivoted in the middle so that, as one end goes up, the other goes down.
Mechanically, a seesaw is a lever and fulcrum.