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Physics114A_L15 - Physics 114A Mechanics Lecture 16(Walker...

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Physics 114A - Mechanics Lecture 16 (Walker: Ch. 6.5) Circular Motion February 1, 2011 John G. Cramer Professor Emeritus, Department of Physics B451 PAB [email protected]
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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. As of today  206/208  clickers are registered.  Recent clicker numbers and cumulative  scores as of Friday, January 28 (20 max) are posted on WebAssign.  Check yours. Physics 114A now has a UW GoPost discussion board at:  https://catalyst.uw.edu/gopost/board/jcramer/20670/   My office hours are 12:30-1:20 PM on Tuesdays and Thursdays in the “114” area  of the Physics Study Center on the Mezzanine floor of PAB C (this building). February 1, 2011 2/30 Physics 114A - Lecture 15
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January 31, 2011 Physics 114A - Lecture 14 3/26 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 26 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
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Circular Motion Position: constant Speed: constant r v = = r r February 1, 2011 4/30 Physics 114A - Lecture 15
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Angular Position θ             The  ang ular po s itio n  The  ang ular po s itio n  θ  (in   (in  radians ) that a partic le  in m ake s  with  radians ) that a partic le  in m ake s  with  the  c o o rdinate  axis  +x is the  c o o rdinate  axis  +x is θ  =   =  s/r , whe re   , whe re   s  is  the  “arc  le ng th”,   is  the  “arc  le ng th”,  i.e ., the  le ng th o f the  arc  trac e d by  i.e ., the  le ng th o f the  arc  trac e d by  the  traje c to ry o f the  partic le  as  it  the  traje c to ry o f the  partic le  as  it  m o ve s  fro m  the  x axis  to  its  c urre nt  m o ve s  fro m  the  x axis  to  its  c urre nt  po s itio n.    po s itio n.    0 | θ| | θ| 2 π 2 π . .             The  “radians ” unit is  ac tually  The  “radians ” unit is  ac tually  dim e ns io nle s s  (le ng th/le ng th), but  dim e ns io nle s s  (le ng th/le ng th), but  s e rve s  to  re m ind us  that it is  an ang le   s e rve s  to  re m ind us  that it is  an ang le   with a partic ular rang e  o f value s .   with a partic ular rang e  o f value s .   The  “de g re e ” m e as ure  o f ang le , o n 
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