According to legend, King Syracuse had craftsmen make him a pure gold crown. However, after the completion, the king suspected that the gold crown made by the craftsman was not pure gold. The craftsman swallowed the gold privately, but he could not destroy the crown, which was as heavy as the pure gold given to the goldsmith at the beginning. This question stumped the king and his ministers. At the suggestion of a minister, the king invited Archimedes to inspect the crown. At first, Archimedes was at a loss about this problem. One day, he took a bath at home. When he entered the bath, he saw the water overflowing. It suddenly occurred to him that the volume of the golden crown can be determined by the displacement of the lateral top solid in the water. After further experiments, he tested the weight of the golden crown. Although the final result is that other metals are mixed into the crown, in fact, the significance of the experiment is greater than finding out the truth that the goldsmith cheated the king, because he found the law of buoyancy: the buoyancy obtained by an object in a liquid is equal to the weight of the liquid it discharges.
One day, King Havilon met another thorny problem: the king built a boat for King Ptolemy of Egypt, because it was too big and too heavy to throw into the sea, and the king said to Archimedes. You can lift the earth, so it should be okay to put the boat in the sea, right? Archimedes asked craftsmen to install a set of exquisitely designed pulleys and levers on the front, back, left and right sides of the ship. Archimedes told 100 people to grab a rope in front of the big ship. He asked the king to pull a rope, and the ship actually slipped slowly into the sea. The king was very happy. ? This is the well-known lever principle: in order to balance the lever, the two moments (product of force and arm) acting on the lever must be equal.
Archimedes made great contributions to the development of mathematics and physics, and exerted an indelible influence on social progress and human development. Theoretical genius and experimental genius are the ideal embodiment of a person. ?