Physics131_L09WI10

# Physics131_L09WI10 - Physics 131 - Mechanics Le cture9...

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Physics 131 - Mechanics Lecture 9 January 27, 2010 Homeyra Sadaghiani

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October 24, 2010 Physics 131 - Lecture 9 Announcements HW#4 is due at 9 a.m. on Wed, February 3 rd First Midterm is on Friday Jan. 29 th .
On Friday, January 29 th , we will have Exam 1, which covers Knight, Chapters 1-4 and my lectures 1-9. Exam 1 will have assigned seating . Exam 1 is closed-book, but you may bring with you one page of notes on a 8½x11” sheet of paper with your name on it and should turn it in with your exam. Bring a Scantron sheet and a scientific calculator with good batteries. Exam 1 will have a multiple-choice section and a free-response section based on lecture example problems and end-of-chapter homework problems in Knight. Exam 1 October 24, 2010 Physics 131 - Lecture 9

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Week Date L# Lecture topic Text reading HW 1 4-Jan 1 Description of course structure, SI units 6-Jan 2 Motion, position, velocity, acceleration 1.1-8 (26 P) HW#0 8-Jan 3 One-dimensional motion 2.1-3 (14 P) 2 11-Jan F1 Furlough (Constant acceleration -Tutorial)   13-Jan 4 Vectors 3.1-4 (13 P) HW#1   15-Jan 5 Constant acceleration 2.4-7 (14 P)   3 18-Jan H1 Holiday (Martin Luther King's Birthday)   20-Jan 6 Two- dimensional motion 4.1-3 (12 P) HW#2   22-Jan 7 Circular and relative motion 4.3-7 (14 P) 4 25-Jan 8 Force, mass, inertial frames 5.1-4 (11 P)   27-Jan 9 Newton’s first & second Law 5.5-7 (8 P) HW#3 October 24, 2010 Physics 131 - Lecture 9 Lecture Schedule We are here!
October 24, 2010 Physics 131 - Lecture 9 A Catalog of Forces: (1. Weight) Weight is the only long range force that we will consider in this class. The agent for the weight force is the entire Earth pulling on the object. Weight acts equally on objects at rest or in motion . The weight vector always points vertically downward , and can be considered to act on the center of mass of the object. 2 9.81 m/s ; wt g F mg = =

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October 24, 2010 Physics 131 - Lecture 9 A Catalog of Forces: (2. Normal) Normal Force A solid object resists the action of another force which compresses it with what we call the normal force . The normal force always acts outward and perpendicular to the surface of the compressed object. The symbol for the normal force is n .
October 24, 2010 Physics 131 - Lecture 9 A Catalog of Forces: (3. Spring) Spring Force A stretched or compressed spring exerts one of the most common contact forces. A spring can either push (when compressed) or pull (when stretched). There is no special symbol for the spring force, but we can use F sp .

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October 24, 2010 Physics 131 - Lecture 9 A Catalog of Forces: (4. Tension) Tension Force A string or rope exerts a contact force on an object when it pulls on it. We call this a tension force, represented by the symbol T . Microscopic View A powerful microscope would see that the string was made up of atoms connected by molecular bonds, that can be thought of as tiny springs holding the atoms together.
October 24, 2010 Physics 131 - Lecture 9 A Catalog of Forces: (5. Friction) Friction At the molecular level, surfaces tend to stick together, impeding motion. This produces the force we call friction . It comes in two varieties:

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October 24, 2010 Physics 131 - Lecture 9
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## This note was uploaded on 10/24/2010 for the course PHY PHYSICS 13 taught by Professor Mylander during the Spring '09 term at Cal Poly Pomona.

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Physics131_L09WI10 - Physics 131 - Mechanics Le cture9...

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