The free falling bodies, a theory by Aristotle, Galileo and Newton.

               To introduce the topic of the free fall of bodies is important to consider

the experience made by Galileo Galilei.

Aristotle thought that the speed with which a body falls was proportional to its 

weight, and since then the sages had abided by the idea; 

for example, the feathers fall very slowly, so why not give credit

to what the eyes see?

Galileo thought air resistance could influence the sense of delaying the fall 

of light bodies having large surface.

According to legend, to prove it, Galilei climbed to the top of the tower of Pisa

with two cannon balls of equal size, cast iron and other wood; the first was ten 

times heavier than the second.

If Aristotle and sages were right, the iron ball was dropped ten

times faster than wood. 

Did that happen? A large number of people had gathered to see the result.

Galileo dropped two balls down carefully at the same time over the railing. 

Oh! The two balls hit the ground at the same time!

Galilei was the first scientist to reach its conclusions through the

modern scientific 

method of combining observation logic, and that logic expressed in 

mathematics, the clear and unmistakable symbolic language of science.

Falling bodies: Refers to all bodies that are dropped into the void from a 

certain height, they reach the ground with the same speed.