lecture22 - Energy Examples Serway and Jewett 8.1 8.3...

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Energy Examples Serway and Jewett 8.1 – 8.3

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Conservative Forces A force is called “conservative” if the work done (in going from some point 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. Later you’ll see this written as: Total work is zero. path 1 path 2 A B W 1 = W 2
If only conservative forces do work, potential energy is converted into kinetic energy or vice versa, leaving the total constant. Define the mechanical energy E as the sum of kinetic and potential energy: E K + U = K + U g + U s + ... Conservative forces only: W = -∆ U Work-energy theorem: W = K So: K + ∆ U = 0 Conservation of mechanical energy

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Concept Quiz You drop two rocks from top of a building. One has mass m and the other mass 2m . When they hit the ground A) they have the same speed and same kinetic energy B) they have the same speed but the first rock has more kinetic energy C) they have the same speed but the second rock has more kinetic energy D) the second rock has a higher speed and more kinetic energy
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This note was uploaded on 10/14/2011 for the course ENGINEER CHEM ENG 3 taught by Professor Ghosh during the Spring '11 term at McMaster University.

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lecture22 - Energy Examples Serway and Jewett 8.1 8.3...

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