What kind of lever is the balance? What principle does it use?

Equal arm lever, power * power arm = resistance * resistance arm

In physics "research lever balance test"
What is the purpose of multiple measurements in lever balance test?

Calculate the average value to reduce the error

The advantage of adjusting the lever in the horizontal position before the experiment is that

One is to make the center of gravity of the lever fall on the fulcrum; the other is to read the arm of force directly from the lever

The experiment, material and process of inclined plane action,
The experiment, material and process of leverage, you know,

Goldbach is a middle school teacher in Germany and a famous mathematician. Born in 1690, he was elected academician of the Petersburg Academy of Sciences in 1725. In 1742, Goldbach found that every even number no less than 6 is two prime numbers (only divisible by itself)

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What kind of lever is the balance? What principle does it use?