The principle of the seesaw is the principle of leverage.

As a kind of amusement toy, the seesaw is very popular among children. But in the process of playing, there are also certain risks. The safe use of seesaws can make children play happier.

People are swinging, and the higher the swing, it shows that mechanical energy is not conserved and is constantly increasing. So where does this increase in mechanical energy come from?

The swing is free-standing, with at least 4 fixed pillars. The pillars should not be attached to the composite structure.

From a scientific point of view, when swinging a swing, the human body swings back and forth with the swing board.