21-potential energy 1

21-potential energy 1 - Phys 211 3/16/09 Chapter 8...

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Phys 211 3/16/09 Chapter 8 Potential Energy Conservation of Energy
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Schedule CAPA Sessions Today and Tomorrow - See Syllabus Tedeschi CAPA 1:25-2:15 pm OfFce Hours - 2:30-4:00 Today and Tomorrow Homework Due - Wednesday 11:59 pm Start Chapter 9 on ±riday if possible
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Work-Energy Review Kinetic Energy K = 1 2 mv 2 Work W = Δ K = F d Constant Force W s = 1 2 k x 1 2 x 2 2 ( ) Spring Force F = k ( x x 0 ) = k d Power P AVG = Δ W Δ t P = dW dt = F cos φ dx dt = F cos v = F v Work transfers energy - sign indicates direction of transfer
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Potential Energy At top, KE=0 At bottom, KE 0 W = Δ K = F d Where does kinetic energy go when the ball reaches the top? Potential Energy of the System Δ U = W Energy of Arrangement of objects of a system (need at least two objects)
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Spring Box System Box loses kinetic energy as spring compresses Spring-box system gains potential energy Note that the spring-box and earth ball systems are reversible
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Conservative Forces
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This note was uploaded on 10/03/2011 for the course PHYS 211 taught by Professor Pettie during the Spring '08 term at South Carolina.

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21-potential energy 1 - Phys 211 3/16/09 Chapter 8...

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