Lect07_(Student_Handout)

Lect07_(Student_Handout) - PHYS 172: Modern Mechanics...

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1 Summer 2009 PHYS 172: Modern Mechanics Lecture 7 – Spring Model of Solids Read 4.1 – 4.8 Reading Quiz 1 & 2
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2 Exams July 1 Phys 112 7 - 9 PM July 15 FRNY 140 7 – 9 PM July 29 FRNY 140 7 – 9 PM August 6 Phys 112 8-10 AM Exam 1 Next Wednesday July 1, 7-9pm, Phys 112 • Covers Chapters 1-4 (all lecture material, reading, HW, recitations, labs). • Equation sheet are already posted • About 70% MC, 30% hand-written. • The exam will be similar (but not identical!) to sample exams posted today on the course website.
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3 Chapter 3 Odds and Ends Today: Spring Model of Solids Connecting the Microscopic and Macroscopic: Counting Springs and Young’s Modulus Spring Model of Solids Tension and Normal Forces Note on Momentum Conservation Is it generally true that ? 0 sys p Δ = G NO. Momentum principle: . If net force = 0, then It is not correct to say that simply because “momentum is conserved.” You MUST say that the system’s momentum is conserved because the net force on the system is zero. 0 sys p Δ = G
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4 system = mosquito + bus Note on Momentum Conservation In lecture 5, why did we conclude bus insect 0? pp Δ = G G It isn’t enough to say “because momentum is conserved” or “forces are equal and opposite.” More words are needed here!!
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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.

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Lect07_(Student_Handout) - PHYS 172: Modern Mechanics...

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