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31-gravitation III - Phys 211 Chapter 13 Gravitation Energy...

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Phys 211 4/10/09 Chapter 13 Gravitation Energy Considerations
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Review Kepler’s First Law: All planets move on elliptical orbits with the Sun at one focus. Kepler’s Second Law: The line that connects a planet to the Sun sweeps out equal areas in equal time. (Conservation of angular momentum.) Kepler’s Third Law: The square of the period of any planet is proportional to the cube of the semi-major axis of its orbit. T 2 R 3 = const F = G m 1 m 2 r 2 ˆ r Newton’s Law of Gravitation:
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Space Shuttle Astronauts in the space shuttle seem to float because: 1) They are so far from Earth that Earth’s gravity doesn’t act any more. 2) Gravity’s force pulling them inward is cancelled by the centripetal force pushing them outward. 3) While gravity is trying to pull them inward, they are trying to continue on a straight-line path. 4) Their weight is reduced in space so the force of gravity is much weaker.
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Potential Energy Potential Energy: Energy of the configuration of a system.
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