"Mass Misconception"

Here's an interesting question: "Why do two balls of different masses when dropped from a certain height drop at the same time?"

People in the ancient times had a general misconception about free-falling objects. Aristotle thought that an object of more mass would fall faster than an object with lesser mass. Since Aristotle was a renowned philosopher, people agreed blindly with his proposition without asking for any proof. Centuries passed and science progressed...
On one fine day, Galileo Galilei, a brilliant young scientist determined to understand the functioning of the universe and the objects in it went up the Leaning Tower of Pisa and threw two balls down (one made of iron and the other made of wood) from an equal height. To the awe of the audience, both the balls touched the ground at the same time, Galileo hence said, disproving Aristotle's hypothesis that:
"The Acceleration of falling objects is same. Thus, the time taken for any object to hit the ground does not depend upon its mass."

Going back to our topic :How is the motion of a free-falling object frictionless?
A free-falling object is not in contact with any surface. We neglect air friction. This motion can thus be called frictionless.

Since the epic experiment that Galileo conducted was at the Leaning Tower Pisa, we named our experiment: "The Pisa Balls"