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Unformatted text preview: Physics 101: Lecture 12, Pg 1 Todays lecture covers Textbook Sections 7.5  7.8 Exam II Physics 101: Lecture 12, Pg 2 Exam I was too difficult Dont 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 Newtons Laws F = m a WorkEnergy F = m a multiply both sides by d W = KE Energy is conserved Useful when know Work done by forces ImpulseMomentum F = m a multiply both sides by t I = 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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 Spring '11
 HA
 Physics

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