Lect8-ch5ch6_2

Lect8-ch5ch6_2 - L8Ch5,Ch6 Spring 2004 PHY 2053C: College...

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1 Spring 2004 PHY 2053C: College Physics A Today: finish: Dynamics: of Circular Motion, Gravity Circular Motion Newton: Gravity Satellites & “Weightlessness” start: Work and Energy Conserved quantities Work Kinetic and Potential Energy L8—Ch5,Ch6 NOTE: I wont be giving back the tests today. They weren’t sorted alphabetically before I got them this morning. We’ll go over it on Wed. (Reminder) Important Points from last Lecture Uniform circular motion implies presence of a Centripetal Force This force can be delivered by friction , norma l, gravity or any other force you can think of. Gravity is a general force between any objects with mass For orbital motion (planets, moon, satellites), gravity provides the centripetal force: F G G m 1 m 2 r 2 G m 1 m 2 r 2 m 1 v 2 r <=> G m 2 2 2 r 3 T 2
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2 (reminder) Gravity r m m G F = 2 More mass , either one, means more force Greater separation means less force Gravity is an attractive force acts along the line between two objects. The force is proportional to the product of the two masses . 1 m Newton’s Law of Universal Gravitation: 2 m F F r The force is inversely proportional to the square of the distance between the masses. Important – BOTH objects feel this force, and are attracted to each other. Satellite Orbits “Newton’s Cannon” Newton devised a “thought experiment” to explain how satellites stay in orbit. A cannonball travels over the ground as it falls toward Earth.
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Lect8-ch5ch6_2 - L8Ch5,Ch6 Spring 2004 PHY 2053C: College...

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