Physics114A_L13 - Physics 114A - Mechanics Lecture 14...

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Unformatted text preview: Physics 114A - Mechanics Lecture 14 (Walker: Ch. 6.1) Friction January 28, 2011 John G. Cramer Professor Emeritus, Department of Physics B451 PAB jcramer@uw.edu January 28, 2011 Physics 114A - Lecture 13 2/29 January 27, 2011 Physics 114A - Lecture 12 Announcements HW#4 is due at 11:59 PM on Thursday, February 3. HW#5 is due at 11:59 PM on Thursday, February 10. There is now a Catalyst Go-Post message board for Physics 114A. The URL is: https://catalyst.uw.edu/gopost/board/jcramer/20670/ Exam 1 was returned on Tuesday. If you did not receive yours, it is available from Susan Miller, room C136 PAB. If you want to request a regrade on a part of Exam 1, first check the solutions on the web, then write on a separate piece of paper a statement of your question or complaint, attach it to your graded paper. Turn this in to Susan Miller by Noon on Monday, January 31. 2/22 January 28, 2011 Physics 114A - Lecture 13 3/29 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 29 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 January 27, 2011 Physics 114A - Lecture 12 3/22 January 28, 2011 Physics 114A - Lecture 13 4/29 Frictional Forces Friction has its basis in surfaces that are not completely smooth: January 28, 2011 Physics 114A - Lecture 13 5/29 Microscopic Friction Magnified section of a polished steel surface showing surface irregularities about 5 x 10-7 m (500 nm) high. This height corresponds to several thousand atomic diameters Computer graphic from a simulation showing gold atoms (below) adhering to the point of a sharp nickel probe (above) that has been in contact with the gold surface. Surface Roughness Adhesion January 28, 2011 Physics 114A - Lecture 13 6/29 Friction vs. Area Question: Why doesnt friction depend on contact area?...
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This note was uploaded on 01/20/2012 for the course PHYSICS 114A taught by Professor Johncramer during the Winter '12 term at University of Washington.

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Physics114A_L13 - Physics 114A - Mechanics Lecture 14...

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