PH2014_Ch12_gravity

# PH2014_Ch12_gravity - Chapter 12: Universal Gravity What is...

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1 Chapter 12: Universal Gravity What is the force that holds a man to Moon, Moon to Earth, and Earth to Sun?

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2 Toward a Law of Universal Gravity Theology <1642 Earth is the center of universe Nicolaus Copernicus 1473- 1543 Planets orbit the Sun not Earth Tycho Brahe 1546- 1601 Accurate planetary observation Johannes Kepler 1571- 1630 Three laws of planetary motions Galileo 1564- 1642 Telescopic observation of the motions of Jupiter’s moons Isaac Newton 1642- 1727 Law of universal gravitation
3 Kepler’s Laws of Planetary Motions First law: The planets move in elliptical orbits, with the sun at one focal point. Second Law: A line draw between the sun and a planet sweeps out equal areas during equal intervals of time. Third Law: The square of a planet’s orbital period is proportional to the cube of the semimajor–axis length. 3 2 a period = τ a=major axis length First & Second Laws Third Law

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4 What makes the planets move as they do?
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## This note was uploaded on 04/17/2008 for the course PHYS 2014 taught by Professor Nandi during the Spring '08 term at Oklahoma State.

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PH2014_Ch12_gravity - Chapter 12: Universal Gravity What is...

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