Explain why a seesaw is closest in arrangement to a first class lever

A seesaw is an example of a first class lever The fulcrum, which is the part of the lever  that does not move, is in the middle. The resistance, which is the weight (person) you are trying to lift is at one end. The effort, which is the force applied to the lever, is the person sitting on the other end.

the gravitational force on an object increase as the mass of an object also, im not going to report you, but this question should be under the science category, not health