Physics114A_L19 - Lecture 19 (Walker: Ch. 8.3-5) Energy...

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February 10, 2009 Physics 114A - Lecture 19 1/24 Physics 114C - Mechanics Lecture 19 (Walker: Ch. 8.3-5) Energy Conservation I February 10, 2009 John G. Cramer Professor of Physics B451 PAB cramer@phys.washington.edu
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February 10, 2009 Physics 114A - Lecture 19 2/24 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 10, 2009 Physics 114A - Lecture 19 3/24 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 10-Feb-09 19 Energy Conservation I 16 18 8-3 to 8-5 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 10, 2009 Physics 114A - Lecture 19 4/24 Conservation of Mechanical Energy Definition of mechanical energy: (8-6) Using this definition and considering only conservative forces, we find: Or equivalently:
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February 10, 2009 Physics 114A - Lecture 19 5/24 Conservation of Mechanical Energy Energy conservation can make kinematics problems much easier to solve:
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February 10, 2009 Physics 114A - Lecture 19 6/24 Conservation of Mechanical Energy mech E K U = + mech 0 E K U = ∆ + ∆ = (Conservation of Mechanical Energy) Note that ; the correct statement is K U K U ≠ ∆ = -∆
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Physics114A_L19 - Lecture 19 (Walker: Ch. 8.3-5) Energy...

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