In the natural state of the atmosphere, a free falling body will be disturbed by air resistance. To eliminate this interference, it is necessary to create a vacuum environment. In Galileo's era, people can not create a vacuum environment by technical means. Therefore, Galileo can only put aside the factors of air resistance in his mind and imagine the movement of a falling body in a vacuum, so as to obtain the law of free falling body, It overturns Aristotle's conclusion about falling body.
ite for Galileo's law of free fall?
Galileo envisioned various possibilities