# lecture23 - Potential Energy Conservative and...

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1 Physics 1D03 - Lecture 22 Potential Energy Serway 7.7; 8.1 – 8.2 Conservative and non-conservative forces Gravitational and elastic potential energy Mechanical Energy Practice problems: Serway chapter 7, problems 39 chapter 8, problems 3, 7, 9, 11 Physics 1D03 - Lecture 22 For every conservative force, we can define a potential energy function U so that W AB = U U A - U B Examples: gravity (uniform g ) : U g = mgy , where y is height gravity (exact, for two particles, a distance r apart): U g - GMm/r , where M and m are the masses Ideal spring: U s = ½ ks 2 , where s is the stretch electrostatic forces (we’ll do this in January)

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2 Physics 1D03 - Lecture 22 Conservative Forces A force is called “conservative” if the work done (in going from A to B) is the same for all paths from A to B. An equivalent definition: For a conservative force, the work done on any closed path is zero. Total work is zero.
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lecture23 - Potential Energy Conservative and...

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