Physics114A_L23 - Physics 114A Mechanics Lecture 23(Walker...

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Physics 114A - Mechanics Lecture 23 (Walker: Ch. 10.1-3) Rotational Kinematics February 18, 2011 John G. Cramer Professor Emeritus, Department of Physics B451 PAB [email protected]
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February 18, 2011 Physics 114A - Lecture 23 2/30 Announcements HW#7 is due at 11:59 PM on Thursday, February 24. Check your Exam 2 section scores on WebAssign under to make sure you have  credit for both sections. The Exam 2 Solutions are available from the Physics  114A Course Schedule by clicking on “Exam 2”.  Regrade requests may be turned  in to Susan Miller (C136 PAB) through noon on Tuesday, February 22.  My office hours are 12:30-1:20 PM on Tuesdays and Thursdays, both in the  “114” area of the Physics Study Center on the Mezzanine floor of PAB A (this  building). Physics 114A now has a UW GoPost discussion board at:  https://catalysttools.washington.edu/gopost/board/jcramer/20670/  
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February 18, 2011 Physics 114A - Lecture 23 3/30 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 7 14-Feb-11 20 Momentum & Impulse 8 23 9-1 to 9-3 Mom. & Collisions 15-Feb-11 21 Momentum Conservation 11 24 9-4 to 9-5 17-Feb-11 22 Collisions & CM 10 22 9-6 to 9-7 HW6 18-Feb-11 23 Rotational Kinematics 13 30 10-1 to 10-3 8 21-Feb-11 H2 President's Day Holiday Angular Kinematics Torque 22-Feb-11 24 Rotational Inertia 5 24 10-4 to 10-5 24-Feb-11 25 Energy Conservation II 5 25 10-6 HW7 25-Feb-11 26 Torque & Equilibrium 18 26 11-1 to 11-4 9 28-Feb-11 27 Angular Momentum 10 25 11-5 to 11-7 Rotational Motion, Mom.of Inertia 1-Mar-11 28 Rotational Dynamics 3 26 11-8 to 11-9 3-Mar-11 R3 Review & Extension - 49 - HW8 4-Mar-11 E3 EXAM 3 - Chapters 9-11 10 7-Mar-11 29 Gravity Revisited 16 29 12-1 to 12-3 Make-up labs 8-Mar-11 30 Gravitational Energy 10 29 12-4 to 12-5 10-Mar-11 31 Oscillations I 14 30 13-1 to 13-4 11-Mar-11 32 Oscillations II 12 32 13-5 to 13-8 HW9 14-Mar-11 FE Final Examination, 2:30 - 4:20 PM, Monday, March 14 (Comprehensive) Lecture Schedule (Part 3) We are here.
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February 18, 2011 Physics 114A - Lecture 23 4/30 Circular Motion Position: constant Speed: constant r v = = r r
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February 18, 2011 Physics 114A - Lecture 23 5/30 A Particle in Uniform Circular Motion 1 circumference 2 1 period r v T π = = period the time required for one complete rotation. T =     For a particle in uniform circular motion, the  velocity vector  v   remains constant in magnitude, but  it continuously changes its direction.  However, at  each position  it is tangent to the circular path.  For  this reason, it is called the  tangential velocity of the particle.
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February 18, 2011 Physics 114A - Lecture 23 6/30 Angular Position θ
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February 18, 2011 Physics 114A - Lecture 23 7/30 Angular Position θ Degrees and revolutions:
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