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Unformatted text preview: Physics 7A-2 (C/D) Professor Chertok Fall, 2008 Lecture 5 Original presentations copyright M. Chertok 2008. All rights reserved. Questions? Outline for today Quiz 4 Take a deep breath! 7:30 lecture: go over end of last lecture slides?? DLM08 - particle spacing What’s ahead in DLM09-10 More of the Particle Model of matter Practice problems,Quiz 5 info M. Chertok, Physics 7A 3 DLM08 Was this fun? 3.1.3 Particle separation for solids, liquids and gasses Water Liquid/gaseous nitrogen! Can the pairwise potential g raph help explain what you saw? M. Chertok, Physics 7A 4 PE for 2-atom system e en ship Potential Energy (in units of well depth, ") Pair-wise or Atom-Atom Potential (as modeled with the Lennard-Jones Potential) 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 Pair-wise Potential (as modeled with the Lennard-Jones Potential) hat . tion um rticle -1.2 distance between centers of atoms, r (in units of particle diameter, ! ) M. Chertok, Physics 7A 5 Questions on PEpair-wise Clicker questions Potential Energy (in units of well depth, ") 2) All “normal” matter is comprised of tiny particles (atoms and molecules) that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another. (paraphrased, Feynman) 3) The pair-wise potential energy for two electrically Pair-wise or Atom-Atom Potential neutral particles has the general shape shown in the Pair-w the L Pot ones Potential) (as modeled withiseennard-Jential graph. Importan...
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