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Physics114A_L18 - Physics 114C Mechanics Lecture 19(Walker...

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Physics 114C - Mechanics Lecture 19 (Walker: Ch. 8.1-2) Potential Energy February 7, 2011 John G. Cramer Professor Emeritus, Department of Physics B451 PAB [email protected]
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Announcements HW#5 is due at 11:59 PM on Thursday, February 10.  HW#6 is due at 11:59 PM on  Thursday, February 17. As of today 207/208 clickers are registered.  Recent clicker numbers and cumulative scores  as of Friday, January 28 (20 max) are posted on WebAssign.  Check yours. Physics 114A now has a UW GoPost discussion board at:  https://catalyst.uw.edu/gopost/board/jcramer/20670/   We will have Exam 2 on Friday, February 11.  It will cover Chapters 5-8 and will be  similar to Exam 1 in its structure.  There will again be assigned seating.  If you have not  already done so and would like to request a left-handed seat, right-handed aisle seat, or  front row seat, E-mail your request to me ASAP.  Two table seats are also available. The  CLUE people plan a review for 114 Exam 2 on Wednesday, February 9 from 6:30-8:00  PM in Mary Gates Hall 228. February 7, 2011 2/26 Physics 114A - Lecture 18
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Lecture Schedule (Part 2) We are here. Physics 114A - Introduction to Mechanics Lecture: Professor John G. Cramer Textbook: Physics, Vol. 1 (UW Edition), James S. Walker Week Date L# Lecture Topic Pages Slides Reading HW Due Lab 4 24-Jan-11 10 Newton's Laws 14 29 5-1 to 5-4 1-D Dynamics 25-Jan-11 11 Common Forces 11 31 5-5 to 5-7 27-Jan-11 12 Free Body Diagrams - 24 - HW3 28-Jan-11 13 Friction 9 27 6-1 5 31-Jan-11 14 Strings & Springs 12 26 6-2 to 6-4 Newton's Laws Tension 1-Feb-11 15 Circular Motion 5 30 6-5 3-Feb-11 16 Work & Energy 11 23 7-1 to 7-2 HW4 4-Feb-11 17 Work & Power 7 25 7-3 to 7-4 6 7-Feb-11 18 Potential Energy 10 26 8-1 to 8-2 Work-energy 8-Feb-11 19 Energy Conservation I 16 18 8-3 to 8-5 10-Feb-11 R2 Review & Extension - 44 - HW5 11-Feb-11 E2 EXAM 2 - Chapters 5-8 February 7, 2011 Physics 114A - Lecture 18 3/26
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Conservative and Nonconservative Forces       Conservative force : the work it does is stored in the form  of energy that can be released at a later time Examples of a conservative force : gravity. spring Example of a nonconservative force : friction Also:  the work done by a conservative force in moving an object  around a closed path is zero; this is  not  true for a nonconservative force. February 7, 2011 Physics 114A - Lecture 18 4/26
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Conservative Force: Gravity      Work done by gravity on a closed path is zero: February 7, 2011 Physics 114A - Lecture 18 5/26
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Nonconservative Force: Friction      Work done by friction on a closed path is  not  zero: February 7, 2011 Physics 114A - Lecture 18 6/26
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Heat: Calories vs. joules       Heat energy is often produced by nonconservative forces.  Energy, particularly heat  energy, is sometimes quantified in units of calories, defined as the heat energy required to  raise 1 gm (1 ml) of water by 1 degree Celsius.  1 cal = 4.186 J.
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