conservation of energy - Chapter 8 Conservation of Energy...

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1 Chapter 8 Conservation of Energy Energy Review • Kinetic Energy – Associated with movement of members of a system • Potential Energy – Determined by the configuration of the system – Gravitational and Elastic • Internal Energy – Related to the temperature of the system
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2 Types of Systems • Nonisolated systems – Energy can cross the system boundary in a variety of ways – Total energy of the system changes • Isolated systems – Energy does not cross the boundary of the system – Total energy of the system is constant Ways to Transfer Energy Into or Out of A System Work – transfers by applying a force and causing a displacement of the point of application of the force Mechanical Waves – allow a disturbance to propagate through a medium (listening radio) Heat – is a mechanism of energy transfer driven by a temperature difference between two regions in space (conduction, convection) Matter Transfer – matter physically crosses the boundary of the system, carrying energy with it Electrical Transmission – transfer is by electric current Electromagnetic Radiation – energy is transferred by electromagnetic waves
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3 Isolated System • For an isolated system, Δ E mech = 0 – Remember E mech = K + U – This is conservation of energy for an isolated system with no nonconservative forces acting • The changes in energy can be written out and rearranged • K f + U f = K i + U i – Remember, this applies only to a system in which conservative forces act • If nonconservative forces are acting, some energy is transformed into internal energy • Conservation of Energy becomes Δ E system = 0 – E system is all kinetic, potential, and internal energies – This is the most general statement of the isolated
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This note was uploaded on 07/30/2011 for the course PHY 2048 taught by Professor Bose during the Spring '08 term at University of Central Florida.

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conservation of energy - Chapter 8 Conservation of Energy...

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