Lect10-ch6ch7_2

Lect10-ch6ch7_2 - L10Ch6,Ch7 Spring 2004 Today PHY 2053C...

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1 Today: finish: Work and Energy Conservation of Energy Conservative & Non-Conservative Forces Linear Momentum Momentum Conservation Elastic and Inelastic Collisions Center-of-mass motion L10—Ch6,Ch7 Today: finish: Work and Energy Conservation of Energy Conservative & Non-Conservative Forces Linear Momentum Momentum Conservation Elastic and Inelastic Collisions Center-of-mass motion Mot i on , For c e s, , Heat , Wave s Dr. David M. Lind Dr. Kun Yang Dr. David Van Winkle Spring 2004 PHY 2053C: College Physics A Energy Conserved quantities : energy & momentum The Total Energy is a conserved quantity. You can not change energy from the inside of a system. You can change energy from the outside by performing work on an object. The Total Momentum is also a conserved quantity. You can not change momentum from the inside. You can change the momentum of an object from the outside by applying a force . rev i ew & prev i ew E KE PE ... 1 2 mv 2 mg h ... constant E W F d cos p m v constant p F t
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2 Examp l e: Energy conservation Loop-the-Loop A small block of mass m=1.0 kg slides, without friction along the loop-the-loop track shown. The block starts from the point P, a distance h=58m above the bottom of the loop of radius R=20 m. What i s the k i net i c energy o f the mass at the po i nt A on the l oop ? So l ut i on: How fa s t i s i t at po i nt A ? Point P: E PE mgh 1.0kg 9.8m/s 2 58m 568.4J Point A:568.4J E PE KE mg 2 R KE => KE A 568.4J mg 2 R 568.4J 1kg 9.8 m s 2 40m KE A 1 2 mv A 2 => v A 2KE A m 18.8 m s = Conservative and Non-conservative Forces
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