Lecture_4_(Student_Handout)

Lecture_4_(Student_Handout) - PHYS 172: Modern Mechanics...

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Summer 2009 PHYS 172: Modern Mechanics Lecture 4 – The Momentum Principle & Predicting Motion Read 2.6–2.10 CLICKER QUESTION #1-2
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Motion Graphs With Momentum and Force Today: The Momentum Principle Reciprocity and Multiparticle Systems Momentum As a Measure of Motion Applying Momentum Principle: Thrown Ball Last Time: momentum of an object: 2 1 1 v c γ = ⎛⎞ ⎜⎟ ⎝⎠ G system surroundings pick a system: momentum principle: impulse
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Applying the Momentum Principle (p. 46) 1. Choose a (some portion of universe). Everything else outside that interacts significantly with the system is called 2. List objects in surroundings that have significant influence on system; make appropriate diagrams 3. Choose initial and final times 4. Apply the momentum principle to the chosen system: Substitute known values into the terms of the momentum principle. Use position update if needed. 5. Check units and reasonableness of your answer net p Ft Δ G G Throwing A Ball 1. how long will it take to get to the top of its trajectory? 2. what is the ball’s position at the top of the trajectory?
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This note was uploaded on 09/14/2009 for the course ENGR 126 taught by Professor Oakes during the Fall '08 term at Purdue University-West Lafayette.

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Lecture_4_(Student_Handout) - PHYS 172: Modern Mechanics...

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