One of the most common examples of uniformly accelerated motion is that of an object allowed
to fall freely near the Earth’s surface. It was widely believed until the time of Galileo that heavier
objects fall faster than lighter objects and that the speed of fall is proportional to how heavy the
object is.
Aristotle believed heavier objects fall to the ground faster than lighter objects. As legend has it,
Galileo dropped two objects from the Leaning Tower of Pisa to disprove Aristotle theory. These
objects were the same size, but different weights. They fell to the ground at the same speed. This
disproved Aristotle’s theory and led Galileo to discover the Law of Falling Bodies.