Physics114A_L27 - Physics 114A - Mechanics Lecture 28...

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Unformatted text preview: Physics 114A - Mechanics Lecture 28 (Walker: Ch. 11.5-7) Angular Momentum February 28, 2011 John G. Cramer Professor Emeritus, Department of Physics B451 PAB jcramer@uw.edu Announcements HW#8 is due at 11:59 PM on Thursday, March 3. HW#9 is due at 11:59 PM on Sunday, March 13. There are still a few people who need to register their clickers. We will have Exam 3 on Friday, March 4. The format will be similar to Exams 1 and 2, with assigned seating. We will have a review for Exam 3 on Thursday, March 3. Bring questions and requests for more on specific topics in Chapters 9-11. The CLUE Organization plans a special review for Physics 114 on Wednesday, March 2, 6-8 PM in 228 Mary Gates Hall. February 28, 2011 2/25 Physics 114A - Lecture 27 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. February 28, 2011 3/25 Physics 114A - Lecture 27 Dynamic Applications of Torque When dealing with systems that have both rotating parts and translating parts, we must be careful to account for all forces and torques correctly and to keep the signs straight. February 28, 2011 4/25 Physics 114A - Lecture 27 Angular Momentum For a particle of mass m moving in a circle of radius r : 2 I mr = / v r = February 28, 2011 5/25 Physics 114A - Lecture 27 Angular Momentum For more general motion, L r p r mv = = February 28, 2011 6/25 Physics 114A - Lecture 27 Example : Angular Momentum (a) What is the angular momentum of a 0.13 kg Frisbee, considered to be a uniform disk of radius 7.5 cm, spinning with = 11.5 rad/s?...
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Physics114A_L27 - Physics 114A - Mechanics Lecture 28...

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