09Lecture_13

# 09Lecture_13 - Lecture 13 Feb 16 2009 Dynamics of Circular...

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0 Lecture 13 Feb. 16, 2009 Dynamics of Circular Motion Satellites in Circular Orbits More Circular Motion – Examples

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1 Announcement Having Trouble with Free Body Diagrams? (Someone might have put them on the coming prelim!) Special Coop on FBD Basics 7:30 - 9:00 p.m. Homework Party 701 Clark Hall Wednesday February 18
2 Lecture 5: Circular motion at constant speed (uniform) a rad v v a rad a rad v a rad = v 2 R Centripetal force: F = m a rad

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3 Gravitation… Force that holds satellites in orbit: gravitational attraction (Lecture 12) velocity and orbital period of satellites in circular orbits? F g = Gm 1 m 2 r 2
4 Example What is the speed of a satellite at 300 km above the surface of the earth? Assume a circular orbit.

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5 Solution Circular orbit only Acceleration points into direction of net force by Earth on Satellite (towards center of Earth) Satellite’s velocity does NOT depend on it’s mass!
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