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Lecture

# Week five gravity.docx

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School
Boston University
Department
Astronomy
Course
CAS AS 101
Professor
Paul Withers
Semester
Fall

Description
WEEK FIVE GRAVITY & NEWTON 1 2 Units of  Force: (N = kg x m/s ) *Earth is  not moving at a constant velocity  Laws of gravity: 1. Every mass attracts every other mass. 2. Attraction is directly proportional to the product of their masses. 3. Attraction is inversely proportional to the square of the distance between their  centers.  F g G (M M1 x 2  2  M1 ­­­­­­­­­­­­­­­­­­­­­­d­­­­­­­­­­­­­­­­­­­­­­­­­­­­M2 Q: If two people were twice as close, the force would be? A: 4 times Keppler 1 = Elliptical Orbits Keppler 2 = Eq2 l 3rea = Equal Time Keppler 3 = p = a   (p= yr , a= au) Kepler’s first 2 laws apply to all orbiting objects – NOT JUST PLANETS (comets, moons, satellites) ­ Can
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