Physics114A_L18 - Lecture 18(Walker Ch 8.1-2 Potential Energy February 9 2009 Physics 114C Mechanics John G Cramer Professor of Physics B451 PAB

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February 9, 2009 Physics 114A - Lecture 18 1/26 Physics 114C - Mechanics Lecture 18 (Walker: Ch. 8.1-2) Potential Energy February 9, 2009 John G. Cramer Professor of Physics B451 PAB [email protected]
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February 9, 2009 Physics 114A - Lecture 18 2/26 Announcements HW5 is due at 11:59 PM on Thursday, February 12. Homework up to 24 hours late will receive 70% credit. As of today 186/205 clickers are registered. I recently sent an E-mail reminder to the unregistered students. Cumulative clicker scores (27 max) as of Tuesday, Feb. 3 are posted on Tycho under “Lecture Score 4”. My office hours are 12:30-1:20 PM on Tuesdays and 2:30-3:20 PM on Thursdays, both in the “114” area of the Physics Study Center on the Mezzanine floor of PAB C (this building). We will have Exam 2 on Friday, February 13. It will cover Chapters 5-8 and will be similar to Exam 1 in its structure. There will again be assigned seating. There are already too many requests for right-handed aisle seats and front row seats, but new requests will be accepted.
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February 9, 2009 Physics 114A - Lecture 18 3/26 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 26-Jan-09 10 Newton's Laws 14 29 5-1 to 5-4 1-D Dynamics 27-Jan-09 11 Common Forces 11 31 5-5 to 5-7 29-Jan-09 12 Free Body Diagrams - 24 - HW3 30-Jan-09 13 Friction 9 29 6-1 5 2-Feb-09 14 Strings & Springs 12 26 6-2 to 6-4 Newton's Laws Tension 3-Feb-09 15 Circular Motion 5 30 6-5 5-Feb-09 16 Work & Energy 11 28 7-1 to 7-2 HW4 6-Feb-09 17 Work & Power 7 25 7-3 to 7-4 6 9-Feb-09 18 Potential Energy 10 26 8-1 to 8-2 Work-energy HW5 13-Feb-09 E2 EXAM 2 - Chapters 5-8 7 16-Feb-09 H2 Presidents Day Holiday Mom. & Collisions 17-Feb-09 20 Momentum & Impulse 8 23 9-1 to 9-3 19-Feb-09 21 Momentum Conservation 11 24 9-4 to 9-5 HW6 20-Feb-09 22 Collisions & CM 10 22 9-6 to 9-7 Lecture Schedule (Part 2) We are here.
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February 9, 2009 Physics 114A - Lecture 18 4/26 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 Example of a conservative force : gravity 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.
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February 9, 2009 Physics 114A - Lecture 18 5/26 Conservative Force: Gravity Work done by gravity on a closed path is zero:
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February 9, 2009 Physics 114A - Lecture 18 6/26 Nonconservative Force: Friction Work done by friction on a closed path is not zero:
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February 9, 2009 Physics 114A - Lecture 18 7/26 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. The equivalent SI unit is the kilocalorie, denoted by Cal or kcal, which is the heat energy required to raise 1 kg (or 1 liter) of water by 1 degree Celsius.
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This note was uploaded on 02/24/2009 for the course PHYS 114 taught by Professor Reid during the Spring '08 term at University of Washington.

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Physics114A_L18 - Lecture 18(Walker Ch 8.1-2 Potential Energy February 9 2009 Physics 114C Mechanics John G Cramer Professor of Physics B451 PAB

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