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Lect9-ch6_2

# Lect9-ch6_2 - L8Ch6 Spring 2004 PHY 2053C College Physics A...

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1 Spring 2004 PHY 2053C: College Physics A Today: Work and Energy Conserved quantities Work, Force and Displacement Kinetic and Potential Energy Conservation of Energy Mot i on , For c e s, Energy , Heat , Wave s Dr. David M. Lind Dr. Kun Yang Dr. David Van Winkle L8—Ch6 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 Principle of Conserved Quantities This week we will study Energy , Next week we will study Momentum , both are conserved quantities: In an isolated system , they can not be changed by any process, be it physical, chemical or biological. Energy can be transformed between several different forms or transfered from one part of the system to another. We w ill f i nd that c on s erved quant i t i e s c an s i mp li fy many o f our c a l c u l at i ons! definition: Work Work is defined as force applied along a distance The unit of work is 1 Joule : 1J = 1 N .
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