lec11 - Physics 140 Fall 2007 lecture#11 9 Oct Ch 7 topics...

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Physics 140 – Fall 2007 lecture #11 : 9 Oct Ch 7 topics: • energy conservation ( E mec change due to non-conservative forces) • force from the derivative of potential energy Announcements: • MaPhys set #5 extension (due this Thursday @ 11:59 pm) • set #6 due next Thursday no classes! next Monday & Tuesday Fall break: 15,16 October Exam 1 score distribution (on scale 0-40)
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34% correct response rate 40% correct response rate
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98% correct response rate Energy is a deeply fundamental concept of physics. Conservation of energy is a simply a fact of nature with no compellingly simple theoretical explanation. The general law of energy conservation states that all changes in the mechanical energy of a system can be accounted for by either internal sources of energy acting within it or external forces acting upon it. Conservation of energy http://www.nrgsc.yk.ca/
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The Unfair Poker Game Analogy… When other (non-conservative ) forces operate on a system, then its mechanical energy will not remain constant. During some time interval ! t , the mechanical energy will change due to the work done by other forces For problems involving gravity ( U g ) and springs ( U g ), another way to express this change is
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This note was uploaded on 04/03/2008 for the course PHYSICS 140 taught by Professor Evrard during the Fall '07 term at University of Michigan.

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lec11 - Physics 140 Fall 2007 lecture#11 9 Oct Ch 7 topics...

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