Phys205A_Lecture18

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

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Lecture 18 Chapter 7 Elastic potential energy Conservative/ nonconservative forces Equilibrium

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Total recall Kinetic Energy is the energy of a particle due to its motion K = ½ mv 2 The quantity mgy is identified as the gravitational potential energy, Ug Ug = mgy z The Work-Kinetic Energy Theorem states S W = K f K i = D K S W = mg( Yf Yi) = D U
Elastic Potential Energy z Elastic Potential Energy is associated with a spring z The force the spring exerts (on a block, for example) z F s = - kx z The work done by an external applied force on a spring- block system is z W = ½ kx f 2 –½ kx i 2 z The work is equal to the difference between the initial and final values of an expression related to the configuration of the system

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Elastic Potential Energy, cont z This expression is the elastic potential energy: U s = ½ kx 2 z The elastic potential energy can be thought of as the energy stored in the deformed spring z The stored potential energy can be converted into kinetic energy z Observe the effects of different amounts of compression of the spring
Elastic Potential Energy, final z The elastic potential energy stored in a spring is zero whenever the spring is not deformed ( U = 0 when x = 0) z The energy is stored in the spring only when the spring is stretched or compressed z

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Phys205A_Lecture18 - Lecture 18 Chapter 7 Elastic potential...

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