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10_03_Energy_2nd_Law - 10/3 Energy Intro 0 Text Chapter 4...

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10/3 Energy Intro 0 Text: Chapter 4 section 9 friction Friction Handout in class today, also on web 0 Problem presentation 0 HW 10/3 text problem 4-54 (The Clown) due Friday 10/5 Show Reasoning!!!!! 0 Lab: “Atwood’s Machine” wrap up 0 “Peer Guides” in “Physics Guidance Center”
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Peer Guide Schedule Do we need morning times?
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Exam Schedule 0 Exam I Sep 20 x Exam II Oct 18 x ExamIII Nov 8 x Exam IVDec 6 od Nov 29? x Final Dec 18, 8:00 AM
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Modified Atwood’s Machine Find the acceleration of the masses, then v f after they move x = 5m. Let g = 10 N/kg m 1 = 2kg, m 2 = 2kg a = a = F net = F net = Apply 2nd Law m 2 m 1 F net same, why? oops m’s and a’s the same 3 4 5 m 1 m 2 W E,1 = 20N W E,2 = 20N T S,1 T S,2 = W X W Y N R,1 Let’s go on anyway and see what happens!
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Modified Atwood’s Machine Find the acceleration of the masses, then v f after they move x = 5m. Let g = 10 N/kg m 1 = 2kg, m 2 = 2kg a = a = F net = F net = Apply 2nd Law m 2 m 1 oops 3 4 5 m 1 m 2 W E,1 = 20N W E,2 = 20N T S,1 T S,2 = W X = 12N W Y = 16N N R,1 For m 1 F netY = 0 = N - W Y So N = W Y = 16N For m 1 F netX = m 1 a = W X - T For m 2 F netX = m 2 a = T - W 2 (m 1 + m
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