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Lect04-1

Lect04-1 - PHYS 172 Modern Mechanics Fall 2009 Lecture 4...

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Fall 2009 PHYS 172: Modern Mechanics Lecture 4 – Conservation of Momentum Read 2.7–2.14

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CLICKER QUESTION #1 Reading Question (Sections 2.7 – 2.14) (This is a closed-book quiz, no consulting with neighbors, etc.) Which of the following are always conserved? A. The total velocity of a system B. The total momentum of a system C. The total momentum of a system + the total momentum of its surroundings D. The sum of the forces acting on a system E. The total momentum of a non-rotating system
Important topics for today: • More on the momentum principle • Impulse • Steps for applying momentum principle • Reciprocity • More than one particle in a system • Conservation of momentum

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t F p p net i f ! + = r r r KEY EQUATIONS t v r r ave i f ! + = r r r position update formula momentum principle
Impulse : For a short time interval, t F ! " r Impulse So, the change in momentum of an object is equal to the impulse applied to it. " r p = r F net " t = Impulse

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Physical models “Spherical cow” Ideal model: ignore factors that have no significant effect on the outcome
Applying the Momentum Principle (p. 46) 1. Choose a system (some portion of universe). Rest of universe is called surroundings . 2. List objects in surroundings that have significant influence on system; make appropriate diagrams 3.

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Lect04-1 - PHYS 172 Modern Mechanics Fall 2009 Lecture 4...

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