Lecture 4 - Lecture 4 9/7/10 Galileo saw that the moons...

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Lecture 4 – 9/7/10 Galileo saw that the moons orbited Jupiter and didn’t fly away a) Galileo’s relativity- relative state of motion of two objects is uniform and acted on by force Newton’s laws a) 1 st law- object will move in a straight line until a force acts on it b) 2 nd law- force = mass x acceleration c) 3 rd law- for every action there is an equal and opposite reaction Newton’s idea about gravity a) Gravity is universal- gravity that is measured here on earth is the same one acting on the moon, etc. b) Gravity can’t extend with the same force forever, i) Must decrease with increasing distance by the square c) Led to inverse square law- F = Gm 1 m 2 /r 2 1, 2 d) If you stand and throw a rock, eventually it will fall at the rate the earth is curving away which is called an orbit (circular orbital velocity) i) If its thrown harder it will escape the orbit (escape velocity) ii) Weightless doesn’t mean that there’s no force acting on you Newton showed that Kepler’s laws were just a consequence of his three laws and the “4
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This note was uploaded on 05/03/2011 for the course AST 301 taught by Professor Harvey during the Fall '07 term at University of Texas at Austin.

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Lecture 4 - Lecture 4 9/7/10 Galileo saw that the moons...

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