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phy2048 lecture14

phy2048 lecture14 - Chapter 8 Potential Energy and...

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8-1 What Is Physics?  8-2 Work and Potential Energy? 8-3 Path Independence of Conservative Forces 8-4 Determining Potential Energy Values 8-5 Conservation of Mechanical Energy 8-6 Reading a Potential Energy Curve 8-7 Work Done on a System by and External Force 8-8 Conservation of Energy Chapter 8: Potential Energy and Conservation of Energy Chapter 8 Homework 7, 15, 16, 21, 27, 34, 38, 42, 51, 52, 53, 58
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Potential Energy Sample Problem 8-2 : Potential energy is associated with a system. The value of potential energy depends on the choice of the reference point (zero potential). The change in potential energy does not depend on the choice of the reference point.
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Potential Energy Curve dx x F dW x dU ) ( ) ( - = - = dx x dU x F ) ( ) ( - = Equilibrium Points 0 ) ( , 0 ) ( = = dx x dU x F 0 ) ( 0 ) ( 0 ) ( 2 2 2 2 2 2 = < dx x U d dx x U d dx x U d Stable Unstable Neutral Turning Points U E K = = mec , 0
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Work Done by External Forces Sample Problem 8-6 : Decelerating crate ? , Find m/s 20 . 0 m/s, 60 . 0 m, 50 . 0 N, 40 kg, 14 th ΔE W v v d F m
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