Galileo studied the principles of velocity and acceleration, gravity and free fall, relativity, inertia and projectile motion, and engaged in the research of applied science and technology, describing the essence of pendulum and "? Still water balance ",invented thermometers and various military compasses, and used telescopes for celestial scientific observation.
Extended data:
Galileo was the first scientist to introduce experiments into mechanics. He determined some important mechanical laws through the combination of experiment and mathematics. 1582, after long-term experimental observation and mathematical calculation, he got the isochronous law of pendulum, and then dropped out of school at 1585 because of family financial difficulties.
He wrote his first paper entitled "Balance" based on the principle of lever and buoyancy. Soon after, he wrote a paper on gravity, which revealed the essence of gravity and center of gravity for the first time and gave an accurate mathematical expression, so he became famous at one fell swoop. At the same time, he questioned many viewpoints of Aristotle.