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phy2048 lecture13

phy2048 lecture13 - Chapter 7 Kinetic Energy and Work 7-1...

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7-1 What Is Physics?  7-2 What Is Energy? 7-3 Kinetic Energy 7-4 Work 7-5 Work and Kinetic Energy 7-6 Work Done by the Gravitational Force 7-7 Work Done by a Spring Force 7-8 Work Done by a General Variable Force 7-9 Power Chapter 7: Kinetic Energy and Work Chapter 7 Homework 3, 5, 7, 13, 19, 20, 28, 29, 37, 43, 48, 57
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Work Done by a Spring Force ) ( kx F d k F x s - = - = Sample Problem 7-8 : Another spring-block system ? compressed is spring the distance by what Find .) 0 ( N/m, 750 m/s, 50 . 0 kg, 40 . 0 d v k v m f i = = = = Sample Problem 7-7 : Spring-block system on horizontal surface Spring Force: Hooke’s Law 2 2 1 2 2 1 f i s kx kx W - = - = = f i f i x x x x x s dx kx dx F W ) (
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Power Average Power t W P = avg Unit Watt (W) 1 W = 1 J/s 1 W = 1 kg·m 2 /s 3 1 hp = 746 W Instantaneous Power dt dW P = r d F dW = v F P = Sample Problem 7-11 : ? Find m/s 0 . 3 N, 0 . 4 N, 0 . 2 2 1 P v F F = = =
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8-1 What Is Physics?  8-2 Work and Potential Energy?
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