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08 - Potential I - Physics 212 Fall 2009 Work and Energy...

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Physics 212 - Fall 2009 9/09/2009
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Work and Energy Gravitational Field - Conservative Field W = F d = mg ( h B h A ) Δ U = U B U A = mg ( h B h A ) W = −Δ U initial final Work is path independent - only depends on the endpoints Work “by the field” decreases the potential energy
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Work on a Charge Electrostatic Field - Conservative Field d W = F d = q 0 Ed W = U f U i Just like the gravitational force, the electrostatic force moves the charge to a lower potential energy W = −Δ U Work is path independent - only depends on the endpoints
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Conservative Force Why is the electrostatic force considered a conservative force? a) Charged particles do not experience friction, which is a non-conservative force. b) The energy required to move a charged particle around a closed path is equal to zero joules. c) The work required to move a charged particle from one point to another does not depend upon the path taken. d) Answers (a) and (b) are both correct. e) Answers (b) and (c) are both correct.
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Sign Matters W = F d = q e Ed cos(180) W = U f U i Switch from positive to negative charge introduces two sign changes:
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