lect03_handout - Physics 102: Lecture 2, Slide 1 Physics...

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Unformatted text preview: Physics 102: Lecture 2, Slide 1 Physics 102: Lecture 3 Electric Potential Energy & Electric Potential Physics 102: Lecture 2, Slide 2 Overview for Today’s Lecture • Electric Potential Energy & Work – Uniform fields – Point charges • Electric Potential (like height) – Uniform fields – Point charges Physics 102: Lecture 2, Slide 3 Recall Work from Phys 101 • Work done by the force given by: – W = F d cos( θ ) – Positive: Force is in direction moved – Negative: Force is opposite direction moved – Zero: Force is perpendicular to direction moved • Careful ask WHAT is doing work! – Opposite sign for work done by you ! • Conservative Forces – ∆ Potential Energy = - W Physics 102: Lecture 2, Slide 4 A B C Uniform E → – In what direction does the force on a negative charge at point A point? 1) left 2) right 3) up Preflight 3.1 !!!!ACT!!!! Physics 102: Lecture 2, Slide 5 A B C Uniform E → When a negative charge is moved from A to C the ELECTRIC force does 1) positive work. 2) zero work. 3) negative work.- F motion Preflight 3.2 Physics 102: Lecture 2, Slide 6 A B C Uniform E → When a negative charge is moved from A to B the ELECTRIC force does 1) positive work. 2) zero work. 3) negative work. Preflight 3.3- F motion Physics 102: Lecture 2, Slide 7 A B C Uniform E → The negative charge is moved from A to C to B. Is the work done by the electric force: A) Greater than W A-B B) Same as W A-B C) Less than W A-B ACT: Work- F W A-B = work done by F E moving charge from A to B Physics 102: Lecture 2, Slide 8...
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This note was uploaded on 02/22/2012 for the course PHYSICS 102 taught by Professor Demarco during the Spring '12 term at University of Illinois, Urbana Champaign.

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lect03_handout - Physics 102: Lecture 2, Slide 1 Physics...

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