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

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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 jcramer@uw.edu
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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  θ  (in  ra dia ns ) that a  partic le  in m ake s  with  the  c o o rdina te  axis  +x is θ  =  s/r , whe re   s  is  the  “arc  le ng th”,  i.e ., the  le ng th o f the  arc  tra c e d by  the  traje c to ry o f the  partic le  a s  it  m o ve s  fro m  the  x a xis  to  its  c urre nt  po s itio n.    0 ≤ | θ| ≤ | θ| ≤ 2 π ≤ 2 π . . The  “radians ” unit is  a c tually  dim e ns io nle s s  (le ng th/le ng th), but  s e rve s  to  re m ind us  tha t it is  an a ng le   with a pa rtic ula r ra ng e  o f va lue s .   The  “de g re e ” m e a s ure  o f ang le , o n  the  o the r hand, is  a  true  dim e ns io n  tha t ha s  to  b e  us e d appro pria te ly.   1 °  = ( π /180 ° ) ra d = 0.0174533 ra d;    1 ra d = 180 ° / π  = 57.296 ° s = r θ ; θ = s/r   February 1, 2011 5/30 Physics 114A - Lecture 15
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A Particle in Uniform Circular Motion 1 circumference 2 1 period r v T π = = period the time required for one complete rotation. T =     Fo r a  partic le  in unifo rm  c irc ula r m o tio n,  the  ve lo c ity ve c to r  v   re m a ins  c o ns ta nt in  m a g nitude , b ut it c o ntinuo us ly c hang e s  its   dire c tio n.
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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_L15 - Physics 114A - Mechanics Lecture 16...

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