Physics131_L12WI10

# Physics131_L12WI10 - Physics 131 - Mechanics Le cture12 Fe...

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Physics 131 - Mechanics Lecture 12 February 5, 2010 Homeyra Sadaghiani

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October 24, 2010 Physics 131 - Lecture 11 Announcements HW#5 is due at 9 a.m. on Wed, February 10th
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 6 8-Feb 13 Uniform circular motion     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 11 Lecture Schedule We are here!

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Feb. 6, 2009 Physics 131 - Lecture 11 Chapter 7. Newton’s Third Law Chapter 7. Newton’s Third Law The harder one sumo wrestler pushes, the harder the other pushes back. Newton’s third law describes how two objects interact with each other. Chapter Goal: To use Newton’s third law to understand interacting objects.
A small nerdy guy and a large football player moving at the same speed collide head-on. Which person experiences the larger average force during the collision? 10050003v2_1 A. The nerdy guy experiences the larger force. B. The football player experiences the larger force. C. Both experience the same force. D. Can’t tell without more information. Feb. 6, 2009 Physics 131 - Lecture 11 Clicker Question

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A small nerdy guy and a large football player moving at the same speed collide head-on. Which person undergoes the larger acceleration during the collision? A. The nerdy guy . B. The accelerations are the same. C. The large football player. D. Can’t tell without knowing the final velocity of the eachmass. 10050003v1_2 Feb. 6, 2009 Physics 131 - Lecture 11 Clicker Question
A small nerdy guy moving at a high speed collides with a stationary large football player. Now, which person experiences the larger average force during the collision? 10050003v2_3 A. The nerdy guy experiences the larger force. B. The football player experiences the larger force. C. Both experience the same force. D. Can’t tell without more information. Feb. 6, 2009 Physics 131 - Lecture 11 Clicker Question

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Feb. 6, 2009 Physics 131 - Lecture 11 Interacting Objects If object A exerts a force on object B, then object B exerts a force on object A. The pair of forces, as shown, is called an action/reaction pair.
Feb. 6, 2009 Physics 131 - Lecture 11 Identify the system Draw a free body diagram for each object in the system

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Feb. 6, 2009 Physics 131 - Lecture 11 Newton’s 3 rd Law
Feb. 6, 2009 Physics 131 - Lecture 11 EXAMPLE 7.3 The forces on accelerating boxes Draw a free-body Diagram for each object in the system,

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Feb. 6, 2009 Physics 131 - Lecture 11 EXAMPLE 7.3 The forces on accelerating boxes Rank in order, from largest to smallest, the horizontal forces.
Feb. 6, 2009 Physics 131 - Lecture 11 EXAMPLE 7.3 The forces on accelerating boxes

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Feb. 6, 2009 Physics 131 - Lecture 11 The Massless String Approximation Often in physics and engineering problems the mass of the string or rope is much less than the masses of the objects that it connects. In such cases, we can adopt the following massless string approximation:
Feb. 6, 2009

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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_L12WI10 - Physics 131 - Mechanics Le cture12 Fe...

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