That would be a first class lever.
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.
balance or lever
it acts like a pair of scales the heavier one moving down and the lighter one going up. why?
It acts like a lever - with the central fixing post simulating the fulcrum.
lever. More specifically in the case of a see-saw, the long board is a balance beam.
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.