Lecture 16 - Lecture 16 pls-16.1 Applications of the Work...

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Lecture 16 pls-16.1 Applications of the Work Energy Theorem / Power Media: 1. Tennis Ball 1. Work-Energy Theorem, Reformulated (1) Æ If an object has an initial i KE and some net work is done on the object, then its KE increase (or decrease) equals the net work done on the object. Sometimes net W is due to both conservative and nonconservative forces, NC C net W W W + = (2) Now we learned last time that (3) If we substitute this into eqn. (2) for C W , we get ( ) NC i f net W PE PE W + = , and then substituting this into eqn. (1) for net W gives us ( ) NC i f i f W PE PE KE KE + = Æ ( ) () NC i i f f W PE KE PE KE + + = + (4) ( ) i f C PE PE W = net i f W KE KE + =
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Lecture 16 pls-16.2 and because the total mechanical energy PE KE ME + = we have (5) Æ If an object has an initial i ME and some nonconservative work is done on the object, then its ME increase (or decrease) equals the nonconservative work done on the object. Notice the similarity of eqn. (5) and eqn. (1).
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This note was uploaded on 03/26/2012 for the course PHY 1020 taught by Professor Kodera during the Fall '11 term at University of Florida.

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Lecture 16 - Lecture 16 pls-16.1 Applications of the Work...

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