Lecture+06+jan24 - Exam watch Lecture #6 (Chapter 23)...

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Lecture #6 (Chapter 23) Electric Potential Energy U and Electric Potential V CRUSH Midterm exam #1 Thursday night Feb 2 at 8:00 – 9:30 pm! Exam watch Any special needs? Contact: phys240lecture@umich.edu
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Recall from Mechanics…… We often had 2 ways to solve for an object’s motion: 1. Force equation: 2. Energy equation: (conservation of energy) 2 2 dt r d m a m F = = external W K U E = + = ) ( Work done by a force in a displacement from initial position i to final f: l d F W f i f i = (Work in Joules)
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E F 0 = = l d F W E roundtrip is a conservative force if: (i.e. The work done is independent of path taken from i to f) The electrostatic force
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The electrostatic force is Conservative f i W E F 0 = = l d F W E roundtrip is a conservative force if: i.e. Is independent of path taken from i to f ) ( ) ( r U r F E - = Then, the following are true: 1. There exists a scalar potential energy function U(r) with 2. U f + K f = U i + K i if no external work is done (conservation of energy) 3. For a slow displacement from rest to rest (K=0): ΔU= U f – U i = W ext,i→f = -W E,i→f (Change in U is the negative of the work done by the conservative force) z k y j x i + + = ˆ ˆ ˆ
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This note was uploaded on 02/15/2012 for the course PHYS 240 taught by Professor Winn during the Winter '11 term at University of Michigan.

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Lecture+06+jan24 - Exam watch Lecture #6 (Chapter 23)...

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