PHYS 183 Lecture Notes - Lecture 6: Circular Motion, Orbital Period, Elipse
8 Sep 2016
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If you increase r has to increase and vice versa: example: spinning skater. A spinning object must spin faster as it shrinks in size. Nothing is at the other focs of the ellipse: second law: A line from the sun to the planet will sweep out equal areas in an equal amount of time. Constraint on how fast the objects move at different parts of the orbit. If the planet is closer to the sun it has to move faster and if its further away it has to move slower: third law. Orbital period squared is proportional to semi major axis. Period (p) = time to complete one orbit. Semi major axis (a) = . 5 the length of the long side of the ellipse. Too much acceleration and it moves to a smaller radius. Not enough and object will move out.
