It acts like a lever - with the central fixing post simulating the fulcrum.
A fulcrum, which is a pivot point that allows the board to move up and down. The seesaw operates on the principle of balance, with one end going up as the other goes down.
LEVERThe long board they sit on acts like a lever.
Lever
A balance or lever.
levers. a simple machine
a lever(toot)
a scale, a teeter toter
That would be a first class lever.
That would be a first class lever.
Same thing as a seesaw. See the Related Link below for pictures.
A seesaw is a lever balanced on a fulcrum.
balance or lever