Archimedes has a long-standing famous saying: "Give me a fulcrum and I can pry up the whole earth!" " "This sentence means the principle of leverage. Archimedes is a great philosopher, encyclopedic scientist, mathematician, physicist and mechanic in ancient Greece. He is the founder of statics and hydrostatics and enjoys the reputation of "the father of mechanics".

Brief introduction of lever principle

Lever principle, also known as "lever balance condition", is a theorem to analyze the force balance of lever, which was first put forward by Archimedes, an ancient Greek scientist. In order to achieve the force balance of the lever, the two moments (product of force and arm) acting on the lever must be equal in magnitude and opposite in rotation direction.

That is to say, the balance condition of lever must be satisfied: power× power arm must be equal to resistance× resistance arm, and the mathematical expression is: F 1 L 1 = F2 L2. Where F 1 stands for power, L 1 stands for power arm, F2 stands for resistance, and L2 stands for resistance arm.