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lect03_handout - Physics 102 Lecture 3 Electric Potential...

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Physics 102: Lecture 2, Slide 1 Physics 102: Lecture 3 Electric Potential Energy & Electric Potential
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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
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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
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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!!!!
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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
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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
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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
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