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Unformatted text preview: 1 Lecture 1: Energy 30 Sept. Reading: Zumdahl 9.1 Outline Energy: Kinetic and Potential System vs. Surroundings Heat, Work, and Internal Energy Recommended Problems: Z9.10, Z9.15, Z9.18, Z9.20, Z9.21 Working these problems are the key to knowing the material and testing whether you understand the ideas. 2 Energy: Kinetic vs. Potential Potential Energy (PE) the energy an object has by virtue of its placement in a Feld of force, like gravity. PE = mgh in this example, where m = mass, g = acceleration due to gravity, h = height Kinetic Energy (KE) the energy an object has by virtue of its motion KE = mv 2 , where m = mass, v = velocity 3 Energy Accounting: Potential vs. Kinetic Potential Energy (PE) the energy an object has by virtue of its placement in a Feld of force, like gravity. PE = mgh , where m = mass, g = acceleration due to gravity, h = height Kinetic Energy (KE) the energy an object has by virtue of its motion KE = mu 2 , where m = mass, u = velocity Kinetic E and Potential E are readily interconverted. Total E = KE + PE = mgh 1 4 Energy Accounting: Potential vs. Kinetic Potential Energy (PE) the energy an object has by virtue of its placement in a Feld of force, like gravity. PE = mgh , where m = mass, g = acceleration due to gravity, h = height Kinetic Energy (KE) the energy an object has by virtue of its motion KE = mu 2 , where m = mass, u = velocity Kinetic E and Potential E are readily interconverted. Total E = KE + PE = mgh 1 5 Energy = KE + PE Total Energy is the sum of kinetic energy and potential energy. Energy is readily converted between these two forms. If the system of interest is isolated (no energy exchange with surroundings), then total energy of the system is constant. 6 Interconversion of KE and PE x = Initial PE = kx 2 where x = displacement, and k is related to spring stiffness At x = 0: PE = 0 KE = kx 2 = mv 2 Red KE Green PE Blue Total E 7 Problem: Z9.15 Ball A (2.0kg) swings down (falls) a height of 10. m, and hits B (4.0kg), transfers all energy to Ball A (2....
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Fall '12 term at University of Washington.
 Fall '12
 Chiu

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