Physics114A_L12 - Physics 114A - Mechanics Lecture 12...

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Physics 114A - Mechanics Lecture 12 (Walker: Ch.5) Free Body Diagrams January 27, 2011 John G. Cramer Professor Emeritus, Department of Physics Office: B451 PAB [email protected]
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January 27, 2011 Physics 114A - Lecture 12 Announcements HW#3 is due at 11:59 PM on Thursday, January 27 (tonight).  HW#4 is due  at 11:59 PM on Thursday, February 3. 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
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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 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 11 23 7-1 to 7-2 HW4 4-Feb-11 17 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
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January 27, 2011 Physics 114A - Lecture 12      A horizontal force  F  acts on a block  that is connected to another block by a  string.   Consider the constraints and the  forces. The Massless String Approximation      Isolate the string and consider the  forces on it: (F net ) x = T A on S –T B on S = m S a , so  T A on S = T B on S + m S a   T B on S   Massless String Approximation: Assume that  m S 0  so that  T A on S = T B on S   4/22
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January 27, 2011 Physics 114A - Lecture 12 Example : Comparing Tensions      Blocks A and B are connected by massless  String 2 and pulled across a frictionless surface  by massless String 1. The mass of B is larger  than the mass of A.      Is the tension in String 2 smaller, equal, or 
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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_L12 - Physics 114A - Mechanics Lecture 12...

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