Lect05 - Physics 212 Lecture 5 Slide 1 Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 5, Slide 1 Physics 212 Lecture 5 Today's Concept: Electric Potential Energy Defined as Minus Work Done by Electric Field Music Who is the Artist? A) Tito Puente B) Buena Vista Social Club C) Louis Prima D) Freddie Omar con su banda E) Los Hombres Calientes Cuban Jazz !! Thanks to Ry Cooder for bringing these guys to our attention !! Why ?? Cuban Jazz at Krannert (Ellnora) Friday night (10:30pm) Marc Ribot y Cubanos Postizos Remembering Arsenio Rodriguez FREE Physics 212 Lecture 5 Physics 212 Lecture 5, Slide 3 Your Comments 05 “This really seems like a rehash of mechanics with electric charges instead of masses.” “Labor Day Weekend and Physics must definitely have the same charge because the weekend kept pushing the homework and this prelecture from getting done.” “Had there been office hours this week I definitely would have been there. I'm still not 100% sure about Gauss' Law.” “When solving for the potential energy, does r1 get subtracted from r2? or is it the other way around?” “Please discuss in lecture about how the point charges will affect the electric field in different situations where it has both same charge or where it has opposite charges. I am confused about this. Also, please go over the potential energy equation to refresh my memory .” “Homework problem style examples would be helpful, the checkpoints felt too easy.” “Still generally confused on some questions about the potential energy, like the third checkpoint.” Discussion Sections this week should help WORKED EXAMPLES! Right! Nothing really new SIGNS! Example today: calculation for CP 3 Physics 212 Lecture 5, Slide 4 = ∫ a a a a i 2 1 r r W F dr Recall from physics 211: = Δ TOT W K F dr W = 0 Constant speed ( Δ K = 0 ) F dr W > 0 Object speeds up ( Δ K > 0 ) W < 0 Object slows down ( Δ K < 0 ) F dr F dr or 9 Physics 212 Lecture 5, Slide 5 Potential Energy conservative U W Δ ≡ - If gravity does negative work, potential energy increases! Same idea for Coulomb force… if Coulomb force does negative work, potential energy increases. + + F + + Δ x Coulomb force does negative work Potential energy increases Physics 212 Lecture 5, Slide 6 Checkpoint 4 A charge is released from rest in a region of electric field. The charge will start to move A) in a direction that makes its potential energy increase B) in a direction that makes its potential energy decrease...
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This note was uploaded on 03/12/2012 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect05 - Physics 212 Lecture 5 Slide 1 Physics 212 Lecture...

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