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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.
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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