More then 2300 years ago, Aristotle (a greek philosopher) claimed that due to the fact that a Rock is heavier from a Feather, the rock will reach ground before the feather if they fall from high level point.
The phrases "heavier as a rock" and "light as a feather" are linked to Aristotle.
2,000 years later, in 1604 an Italian scientist name Galileo Galilee claimed that two objects will reach ground at the same time regardless there shape, weight or any difference in physical dimensions, if there is no friction involved.
Galileo claimed that the air friction influence the feather falling and not his light weight.
Use the link below to simulate Galileo's tests with different sizes.
You can use friction and no friction as well.
Decide who os right, Aristotle or Galileo ?