Seesaw, a children's toy with more than two people. Sitting on the seesaw, one person sits at one end, one person goes up and one person comes down. The seesaw principle is the lever principle, the pressure of people on the seesaw is power and resistance, and the distance from people to the fixed point of the seesaw is power arm and resistance arm respectively. The downward acceleration leads to one up and one down. The downward acceleration of the high is greater than that of the low, so the high drops. At the same time, the low is tilted up under the action of the lever principle, so it circulates.
If other children are playing on the seesaw, keep a distance while waiting. Never put your foot under the tilted seesaw, stand in the middle of the beam of the seesaw, or try to climb onto the seesaw that is tilting up and down.