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Unformatted text preview: Physics 101: Lecture 12, Pg 1 Today’s lecture covers Textbook Sections 7.5  7.8 Exam II Physics 101: Lecture 12, Pg 2 Exam I was too difficult Don’t be discouraged Exam results have been scaled to historical average Physics 101: Lecture 12, Pg 3 Score, max grade, median grade, min grade, # exams from ONE earlier semester 40 44 D, F, F N: 03 45 49 C, D, D N: 02 50 54 C, D, F N: 17 55 59 B, D+, D N: 12 60 64 B, C, D N: 32 65 69 B+, C, F N: 46 70 74 A, C+, D N: 60 75 79 A, B, D N: 41 80 84 A, B, D N: 51 85 89 A+, B+, C N: 55 90 94 A+, A, D N: 57 95 99 A+, A, B+ N: 17 Physics 101: Lecture 12, Pg 4 Newton’s Laws Σ F = m a WorkEnergy Σ F = m a multiply both sides by d Σ W = Δ KE Energy is “conserved” Useful when know Work done by forces ImpulseMomentum Σ F = m a multiply both sides by Δ t Σ I = Δ p Momentum is “conserved” Useful when EXTERNAL forces are known Works in each direction independently Physics 101: Lecture 12, Pg 5 “before” “after” m 1 m 2 m 1 m 2 “before” “after” M m 1 m 2 • Draw “before”, “after” • Define system so that F ext = 0 • Set up axes • Compute P total “before” • Compute P total “after” • Set them equal to each other Procedure Physics 101: Lecture 12, Pg 6...
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This note was uploaded on 02/05/2012 for the course PHYS 101 taught by Professor Ha during the Spring '11 term at University of Illinois at Urbana–Champaign.
 Spring '11
 HA
 Physics

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