Keith Mack
Galileo's challenge of the Church's authority through his assault on the Aristotelian conception of the Universe eventually got him into deep trouble with the Inquisition. Galileo made extensive contributions to our understanding of the laws governing the motion of objects, disputing Aristotle's ideas that heavier bodies fell faster than lighter bodies. Instead, he realised that all matter was subject to the same laws of motion and that all bodies would fall or accelerate at the same speed provided differences in friction or wind-resistance were eliminated.
| Characteristics | Values |
|---|---|
| Challenged authority | Disputed Aristotle's ideas about the laws of motion |
| Discovered principle | Inertia |
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What You'll Learn
Galileo challenged the Church's authority
Galileo made extensive contributions to our understanding of the laws governing the motion of objects. The famous Leaning Tower of Pisa experiment may be apocryphal, but it is certain that Galileo understood the principle involved and probably did similar experiments. The realisation that the acceleration due to gravity is independent of the weight of an object was important to the formulation of a theory of gravitation by Newton.
Galileo's law of fall claims that bodies fall at a constant acceleration, i.e. that their speed increases by equal increments within equal time periods, and that the distance travelled by them in equal time periods is not equal. For example, a falling ball, in the second second of its fall, will travel a distance three times as great as the distance it travelled during the first second.
Galileo disputed all of Aristotle's ideas in a satirical manner, but he insisted that the experimental test must have sufficient precision in order for it to be a robust test.
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He assaulted the Aristotelian conception of the universe
Galileo's challenge of the Church's authority through his assault on the Aristotelian conception of the Universe eventually got him into deep trouble with the Inquisition. Aristotle believed that heavier bodies fell faster than lighter bodies, but Galileo realised that all matter was subject to the same laws of motion and that all bodies would fall or accelerate at the same speed provided differences in friction or wind-resistance were eliminated. He also realised that the natural state of an object is rest, unless it is acted upon by an external force, and that it had an inherent resistance to move (i.e. he discovered the principle of inertia). This realisation was to be very important for Newton.
Galileo's law of fall claims that bodies fall at a constant acceleration, i.e., that their speed increases by equal increments within equal time periods, and that the distance travelled by them in equal time periods is not equal. For example, a falling ball, in the second second of its fall, will travel a distance three times as great as the distance it travelled during the first second; in the third second it will travel a distance five times that of the first second; in the fourth second it will travel a distance seven times that of the first second.
Galileo also made extensive contributions to our understanding of the laws governing the motion of objects. The famous Leaning Tower of Pisa experiment may be apocryphal. It is likely that Galileo himself did not drop two objects of very different weight from the tower to prove that (contrary to popular expectations) they would hit the ground at the same time. However, it is certain that Galileo understood the principle involved, and probably did similar experiments. The realisation that, as we would say in modern terms, the acceleration due to gravity is independent of the weight of an object was important to the formulation of a theory of gravitation by Newton.
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He discovered the principle of inertia
Galileo broke the Church's laws by challenging its authority through his assault on the Aristotelian conception of the universe. Aristotle believed that heavier bodies fell faster than lighter bodies, but Galileo realised that all matter was subject to the same laws of motion and that all bodies would fall or accelerate at the same speed provided differences in friction or wind-resistance were eliminated.
Galileo's realisation was very important for Newton, who used it to formulate a theory of gravitation. Newton realised that the acceleration due to gravity is independent of the weight of an object. This means that two objects of very different weights will hit the ground at the same time if they are dropped from the same height.
Galileo's law of fall claims that bodies fall at a constant acceleration, i.e. that their speed increases by equal increments within equal time periods. This means that a falling ball will travel a distance three times as great in the second second of its fall as it did in the first second, and a distance five times as great in the third second.
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He disputed Aristotle's ideas about motion
Galileo's challenge of the Church's authority through his assault on the Aristotelian conception of the universe eventually got him into deep trouble with the Inquisition. He disputed Aristotle's ideas about motion, claiming that all matter was subject to the same laws of motion and that all bodies would fall or accelerate at the same speed provided differences in friction or wind resistance were eliminated. This was contrary to Aristotle's belief that heavier bodies fell faster than lighter bodies.
Galileo also realised that the natural state of an object is rest, unless it is acted upon by an external force, and that it had an inherent resistance to move. This is known as the principle of inertia. He discovered this principle through his experiments with friction, realising that as frictional forces were decreased (for example, by placing oil on a table), an object would move further and further before stopping.
Galileo's law of fall claims that bodies fall at a constant acceleration, meaning that their speed increases by equal increments within equal time periods, and that the distance travelled by them in equal time periods is not equal. For example, a falling ball will travel a distance three times as great in the second second of its fall as it did in the first second, and five times as great in the third second.
Galileo's understanding of the laws governing the motion of objects was important to the formulation of a theory of gravitation by Newton.
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He contributed to our understanding of the laws governing the motion of objects
Galileo made extensive contributions to our understanding of the laws governing the motion of objects. He realised that all matter was subject to the same laws of motion and that all bodies would fall or accelerate at the same speed provided differences in friction or wind-resistance were eliminated. This was in direct contrast to Aristotle's idea that heavier bodies fell faster than lighter bodies.
Galileo also realised that the natural state of an object is rest, unless it is acted upon by an external force, and that it had an inherent resistance to move. This is the principle of inertia, which states that if the frictional forces could be reduced to exactly zero, an object pushed at a constant speed across a frictionless surface of infinite extent will continue at that speed forever after we stop pushing, unless a new force acts on it at a later time.
The famous Leaning Tower of Pisa experiment may be apocryphal. It is likely that Galileo himself did not drop two objects of very different weight from the tower to prove that they would hit the ground at the same time. However, it is certain that Galileo understood the principle involved, and probably did similar experiments.
Galileo's law of fall claims that bodies fall at a constant acceleration, i.e., that their speed increases by equal increments within equal time periods, and that the distance travelled by them in equal time periods is not equal. For example, a falling ball, in the second second of its fall, will travel a distance three times as great as the distance it travelled during the first second.
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Frequently asked questions
No, but he did challenge the Church's authority and got into trouble with the Inquisition because of his assault on the Aristotelian conception of the universe.
He disputed Aristotle's ideas in a satirical manner, particularly his conception of the universe.
Aristotle believed that heavier bodies fell faster than lighter bodies, but Galileo realised that all matter was subject to the same laws of motion and that all bodies would fall or accelerate at the same speed provided differences in friction or wind-resistance were eliminated.
