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Planetary
orbits
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Kepler figured out the answer,
Newton added understanding
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Kepler's 3 laws:
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1) Planets orbit Sun in an
ellipse with the Sun at one focus
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2) A line joining the planet
to the Sun sweeps out equal areas in equal intervals of time
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3) P2 = a3
(Period in years, semi major axis in AU)
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Newton's form of Kepler's
3d law:
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Newton's laws of motion:
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1) A body at rest remains
at rest, a body in motion remains in motion with a constant velocity (same
direction and speed) unless acted on by a net outside force
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2) F = ma
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3) For every action (force),
there is an equal and opposite reaction
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Newton's Universal law of
gravitation (the apple thing):
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