It is said that Galileo dropped objects of the same material, but of different weights, from the Tower of Pisa to prove that the time they took to fall did not depend on their weight. This was contrary to what Aristotle had taught: that heavy objects fall faster than lighter ones.
Galileo also thought that objects keep their speed unless a force - often friction- slowed them down. But Galileo's dicoveries were not entirely original.
Nicole Oresme in the 14th century had already thought about the mathematical law for acceleration';
Ibn al-Haytham had proposed ideas along the same lines centuries earlier and Mo Tzu had discovered it centuries before either of them.
However, Galileo was the first person who expressed these ideas mathematically and checked them with experiments.
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