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Physics114A_L11

# Physics114A_L11 - Physics 114A Mechanics Lecture 11(Walker...

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Physics 114A - Mechanics Lecture 11 (Walker: 5.5-7) Common Forces January 25, 2011 John G. Cramer Professor Emeritus, Department of Physics Office: B451 PAB [email protected]

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3 0 4 0 Exam 1 Statistics Average = 74.4 Std Dev = 16.2 1.8 2.8 3.8 High = 100 Median = 77 Low = 27 January 25, 2011 2/31 Physics 114A - Lecture 11
Announcements Homework Assignment #3 and #4 are due at 11:59 PM on Thursday,  January 27 and Thursday, February 3, respectively . As of today 202/208 clickers are registered.  I will soon post interim  clicker scores on WebAssign under “Lecture Score”. Exam 1 papers are being returned today (unless you checked the box  asking yours to be withheld).  Scores for the two parts of Exam 1 are  also available on WebAssign.  The Exam 1 solutions are available on the  web from the “Exam 1” link on the Physics 114A Lecture Schedule. January 25, 2011 3/31 Physics 114A - Lecture 11

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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 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 25, 2011 4/31 Physics 114A - Lecture 11
Newton’s 3 rd Law Newton’s 3 rd Law:   Every force occurs as one member of an  action/reaction pair of forces. The two members of the action/reaction force pair act on two  different  objects. The two members of the action/reaction pair are equal in magnitude  and opposite in direction: A on B B on A F F = - r r Alternate Wording:  “For every action there is an equal and opposite reaction.” Implication of Newton’s Laws:  the  interaction  is the principal item  of  interest;  the force is an aspect of the interaction. Consequence of Newton’s 3 rd Law:  a closed isolated system cannot accelerate  due to internal motions (the “no space-drive” theorem). January 25, 2011 5/31 Physics 114A - Lecture 11

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Newton’s 3 rd Law of Motion Some action-reaction pairs: January 25, 2011 6/31 Physics 114A - Lecture 11
Newton’s 3 rd Law of Motion      Although the accelerations are the same, the net force on  the two boxes will not be unless the boxes have the same mass.

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