# lecture12 - Physics 101 Lecture 12 Pg 1 Today’s lecture...

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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 Work-Energy Σ F = m a multiply both sides by d Σ W = Δ KE Energy is “conserved” Useful when know Work done by forces Impulse-Momentum 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.

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lecture12 - Physics 101 Lecture 12 Pg 1 Today’s lecture...

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