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Galileo dropped a cannonball and a musketball simultaneously from a tower, and observed that they hit the ground at nearly the same time.
Theories based on observation were not always subject to [[experiment]]al test, and some errors lingered on for centuries. The best known was Aristotle's theory of [[falling objects]], which despite its went essentially unchallenged until the [[Renaissance]].
Theories based on observation were not always subject to [[experiment]]al test, and some errors lingered on for centuries. The best known was Aristotle's theory of [[falling objects]], which despite its went essentially unchallenged until the [[Renaissance]].
* Galileo dropped a cannonball and a musketball simultaneously from a tower, and observed that they hit the ground at nearly the same time. This contradicted Aristotle's long-accepted idea that heavier objects fell faster. [http://www.vias.org/physics/bk1_05_01.html]
* Galileo determined that the [[acceleration]] of these bodies is constant. He demonstrated that an object released from a height starts with zero velocity and increases its speed with time (before him it was thought that bodies when released acquire instantaneously a [[velocity]] which remained constant but was larger the heavier the object was). Experimenting with inclined planes, and measuring a ball's positions after equal time intervals Galileo discovered the mathematical expression of the law of falling bodies: the distance increases as the square of the time. [http://physics.ucr.edu/~wudka/Physics7/Notes_www/node49.html]
* Galileo determined that the [[acceleration]] of these bodies is constant. He demonstrated that an object released from a height starts with zero velocity and increases its speed with time (before him it was thought that bodies when released acquire instantaneously a [[velocity]] which remained constant but was larger the heavier the object was). Experimenting with inclined planes, and measuring a ball's positions after equal time intervals Galileo discovered the mathematical expression of the law of falling bodies: the distance increases as the square of the time. [http://physics.ucr.edu/~wudka/Physics7/Notes_www/node49.html]