Phys205A_Lecture19

Physics for Scientists & Engineers with Modern Physics (4th Edition)

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Chapter 8 Conservation of Energy
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Energy Review z Kinetic Energy z Associated with movement of members of a system z Potential Energy z Determined by the configuration of the system z Gravitational, Electrostatic, Elastic z Internal Energy z Related to the temperature of the system
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Types of Systems z Nonisolated systems z Energy can cross the system boundary in a variety of ways z Total energy of the system changes z Isolated systems z Energy does not cross the boundary of the system z Total energy of the system is constant
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Ways to Transfer Energy Into or Out of A System z Work – transfers by applying a force and causing a displacement of the point of application of the force z Mechanical Waves – allow a disturbance to propagate through a medium z Heat – is driven by a temperature difference between two regions in space
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More Ways to Transfer Energy Into or Out of A System z Matter Transfer – matter physically crosses the boundary of the system, carrying energy with it z Electrical Transmission – transfer is by electric current z Electromagnetic Radiation – energy is transferred by electromagnetic waves
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Conservation of Energy z Energy is conserved z This means that energy cannot be created nor destroyed z If the total amount of energy in a system changes, it can only be due to the fact that energy has crossed the boundary of the system by some method of energy transfer
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Conservation of Energy, cont.
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Phys205A_Lecture19 - Chapter 8 Conservation of Energy...

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