Why did the stone and the feather fall to the ground at the same time?

In the 4th century BC, there was a famous Greek philosopher named Aristotle. He believed that heavy objects fall faster and light objects fall slower. If the feather and the stone are allowed to fall at the same time, the stone will fall to the ground quickly and the feather will fall to the ground slowly. For nearly 2,000 years, Aristotle's views were considered absolutely correct. In the 16th century AD, Italian physicist Galileo Galilei first challenged Aristotle. He cleverly proposed: What would happen if a heavy object and a light object were tied together? This question just highlights Aristotle's flaw. Heavy objects fall fast, light objects fall slowly, the light and heavy objects are tied together, the fast becomes slower, and the slow becomes faster. According to Aristotle's point of view, the falling speed should be slower than the heavier one and faster than the light one. Light objects and heavy objects are tied together, and the falling speed is neither fast nor slow. On the other hand, according to Aristotle's point of view, if a heavy object falls quickly, then the light object is tied to the heavy object and is heavier than the heavy object, so it should fall faster.

Galileo actually picked on authoritative figures and pointed out the contradictions in Aristotle's theory. This offended many scholars and professors, and they all asked him to provide evidence, thus creating the famous The story of the leaning tower experiment.

According to legend, one day in 1590, a notice appeared on the campus of the University of Pisa, Italy. The notice told people that the young Professor Galileo (only 26 years old at the time) had an affair with several of his students. With the help of the students, a heavy object landing experiment will be conducted on the Leaning Tower of Pisa at noon the next day, and all teachers and students are invited to watch.

At noon the next day, many people came to the Leaning Tower of Pisa, some of them were curious, and some of them wanted to see Galileo's jokes.

The experiment began. Galileo asked a student to first climb to the second floor of the Leaning Tower and put two shot put weighing 1 pound and 10 pounds respectively into a special box. I saw Galileo waving his hand under the tower. The student holding the box touched the button, and the box opened immediately. Two balls of different weights left the box at the same time. In the blink of an eye, there was only a "pop" sound, and two shot balls of different weights hit the ground at the same time. , which surprised everyone present. Galileo then repeated the experiment on the third, fifth and top floors of the tower. Each time, lead balls of different weights dropped from the same height reached the ground at the same time.

This is the famous leaning tower experiment. It used irrefutable facts to correct Aristotle's erroneous view of "the heavier the object, the faster it falls", which had ruled for nearly 2000 years.

Later, people used glass tubes for experiments. The tube is about 1.5 meters long, with one end closed and an air extraction switch at the other end. Put metal coins, lead shot, small feathers, pieces of paper and other small objects of different shapes and weights into the tube. First let there be air in the glass tube. Turn the glass tube upside down quickly. You will see that the objects fall at different speeds. . If you evacuate the air from the glass tube and then quickly turn the tube upside down, you will see all the objects fall to the bottom at the same time. If the effect of air resistance is removed, all objects fall at the same speed.