# chap7 - Energy of a System Chapters 7 and 8 differ slightly...

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1 Energy of a System Chapters 7 and 8 differ slightly between the 6 th and the 7 th editions of the textbook by Serway and Jewett. Both chapters together have the same content in both editions; the material has only been reorganized. In these lectures, we will follow the 7 th edition. Systems and Environments A valid system may be • a single object or particle • a collection of particles • a region of space • varying in size and shape (like a rubber ball)

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2 Work Done by a Constant Force No Work done by Normal Force
3 Who does the work? • Work can be done by forces NOT causing the motion • Useful to formulate “Work is done by ____ on ____” The work done by a star on a planet in a circular orbit, through the gravitational force, is: Positive N egat iv e Zero I mp oss i bl e t o det er m . .. 46 16 134 20 1. Positive 2. Negative 3. Zero 4. Impossible to determine with the information given

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4 Can work ever be done by a centripetal force? Yes No I’m n ot sur e 39 25 160 1. Yes 2. No 3. I’m not sure Can work be done on a system is there is no motion? 1 2 3 4 29 167 12 14 1. Yes, provided an outside force is applied. 2. Yes, since motion is only relative. 3. No, since a system which isn’t moving has no energy. 4. No, because of the way work is defined.
5 Scalar Product of Two Vectors Scalar product – Special Cases

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Scalar Product in Components Positi v e Negative Zer o Can’ t el l f r om he in. A B
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## This note was uploaded on 09/25/2011 for the course PHYS 131 taught by Professor Bennewitz during the Spring '07 term at McGill.

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chap7 - Energy of a System Chapters 7 and 8 differ slightly...

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