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Unformatted text preview: Work and energy Lecture 16 in a nutshell ext W PE KE = ∆ + ∆ The work you do or someone or something which wants something to happen The amount of your work which went into increase potential energy Anything else left over which accelerates the object= W net h Converting KE to PE Mgh = Initial PE Initial KE=0 Final KE= 2 1 2 M υ = Final PE ext W PE KE = ∆ + ∆ If external force is zero PE KE = ∆ + ∆ f i f i PE PE KE KE = + ( 29 ( 29 i f PE KE PE KE + = + If no friction This is the very important conservation of energy =Total energy f i f i PE PE KE KE = + Converting KE to PE Conservative systems A B C A ball slides down a chute starting from rest at point A What is the speed of the ball at B and C Mgh = i PE 5 Mg = KE i =0 5 Mg = Total energy At B 5 Mg = 2 1 3.2 2 Mg M υ + 2 1 1.8 2 Mg M υ = ( 29 ( 29 2 2 1.8 9.8 υ = 2 35.3 υ = 6 / B m s υ = Converting KE to PE Conservative systems A B C A ball slides down a chute starting from rest at point A What is the speed of the ball at B and C...
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 Fall '07
 Dr.Jackman
 Physics, Energy, Force, Potential Energy, Work, Robert Hooke, PEi, mgh, Conservative Systems

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