# Lecture-11 - Work WorkandEnergy Lecture#11 Ch.6.4 6.9...

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ork and Energy Work and Energy Lecture #11 – Ch. 6.4 – 6.9 Physics 125–Fall 2010 Dr. Mike Melnichuk mmeln@umich.edu Office: 2409 Randall Lab phys125lecture@umich.edu ffice Hours: 2:00 :00 / Mon & Tue Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Gravitational Potential Energy Work done by the Force of Gravity (Weight): () ( ) gravity 0 0 0 f Wm g cos 0 s mg hh m g hm g hP E P E . × = = = ⎡⎤ ⎣⎦ PE mgh = (Gravitational) Potential Energy
Work of Gravity Work done by the Force of Gravity (Weight) in this case: gravity 0 0 f W mgh mgh PE PE . =− = he Work done by the force of gravity (m ) is The Work done by the force of gravity (mg) is INDEPENDENT of the path; it depends ONLY f0 on the final (h ) and initial (h ) height ralative the surface of the Earth to the surface of the Earth.

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Conservative Force The Force of Gravity is a CONSERVATIVE FORCE. A CONSERVATIVE FORCE is a force for which the Work done by it is independent of the path between the initial and final positions.
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## This note was uploaded on 12/08/2011 for the course PHYSICS 125 taught by Professor Unknown during the Fall '08 term at University of Michigan.

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Lecture-11 - Work WorkandEnergy Lecture#11 Ch.6.4 6.9...

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