{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Physics131_L13WI10

# Physics131_L13WI10 - Physics 131 Mechanics Le cture13 Fe...

This preview shows pages 1–14. Sign up to view the full content.

Physics 131 - Mechanics Lecture13 February 8, 2010 Homeyra Sadaghiani

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
October 24, 2010 Physics 131 - Lecture 13 Announcements HW#5 is due at 9 a.m. on Wed. February 10 th The Conservation of momentum tutorial homework is due Wed. February 17 th 2
Week Date L# Lecture topic Text reading HW 5 1-Feb 10 Equilibrium, using the 2nd Law 6.1-3 (12 P)   3-Feb 11 2nd Law Application: Friction, Drag 6.4-6 (12 P) HW#4   5-Feb 12 Newton’s 3rd Law: Interaction 7.1-5 (19 P) 6 8-Feb 13 Uniform circular motion 8.1-7 (18 P)   10-Feb 14 Momentum, Impulse & conservation of momentum 9.1-3   12-Feb F1 Conservation of momentum Tutorial 7 15-Feb H2 Holiday (Presidents' Day)   17-Feb 16 Inelastic collisions 9.4-6 (12 P) HW#6   19-Feb 16 Energy 10.1-4 (13 P) 8 22-Feb 17 Potential energy and elastic collision 10.5-7 (13 P) 24-Feb 18 Work & kinetic energy 11.1-3 (10 P) HW#3 26-Feb E2 EXAM 2- Chapters 5-9 October 24, 2010 Physics 131 - Lecture 13 Lecture Schedule We are here! 3

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
October 24, 2010 Physics 131 - Lecture 13 4 Chapter 8. Dynamics II: Motion Chapter 8. Dynamics II: Motion in a Plane in a Plane Chapter Goal: To learn how to solve problems about motion in a plane.
ME-D-PW PAIL OF WATER October 24, 2010 Physics 131 - Lecture 13 Water is contained in the bucket by centripetal force supplied by your arm. 5

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
October 24, 2010 Physics 131 - Lecture 13 6 Does the Water Does the Water Stay in the Stay in the Glass? Glass? A. Yes A. Yes B. No B. No C. Not sure C. Not sure Clicker Question
October 24, 2010 Physics 131 - Lecture 13 7 Review: Uniform Circular Motion Review: Uniform Circular Motion

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
October 24, 2010 Physics 131 - Lecture 13 8 Best Choice of Coordinate Best Choice of Coordinate System System
October 24, 2010 Physics 131 - Lecture 13 9 Uniform Circular Motion Uniform Circular Motion The acceleration of uniform circular motion points to the center of the circle. Thus the acceleration vector has only a radial component a r . This acceleration is conveniently written in the rtz -coordinate system as

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
October 24, 2010 Physics 131 - Lecture 13 10 Dynamics of Uniform Circular Dynamics of Uniform Circular Motion Motion The usefulness of the rtz - coordinate system becomes apparent when we write Newton’s second law in terms of the r -, t -, and z -components, as follows:
October 24, 2010 Physics 131 - Lecture 13 11/30 Centripetal Force Thecentripetal force f cp , required to keep an object of mass m moving in a circleof radius r . Themagnitudeof theforce f cp , called centripetal force becauseit points toward thecenter of rotation, is given by: 2 2 cp cp v f ma m m r r ϖ = = =

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
October 24, 2010 Physics 131 - Lecture 13 12/30 Sources of Centripetal Force This centripetal force may beprovided by the tension in a string, thenormal force, or friction, among other sources.
October 24, 2010 Physics 131 - Lecture 13 13 Problem Solving Strategy Picture: Remember that when circular motion is involved, you should never label a force such as “centripetal force” on a free-body diagram.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}