ME 242 Lecture 12 02.18

ME 242 Lecture 12 02.18 - ME 242 Dynamics February 18, 2009...

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1 ME 242 Dynamics February 18, 2009 Eric Wang Midterm Next Friday • Friday 2/27 – 1-page, 1-side, “cheat sheet” (submit w/exam) – Closed book, closed notes – Starts at NOON (not 12:05 as usual) • TA will hold optional review on Monday (I’m out of town) • Sample problems next Wednesday • Covers up to section 3.3 (kinetics in path coordinates) Today’s Key Concepts Impulse-Momentum Equation • Impulse • Momentum • Systems of Particles • Conservation of Momentum F dt t 1 t 2 = ( mv ) 2 ( mv ) 1 Start with Newton’s 2 nd Law F = d dt ( mv ) F dt t 1 t 2 = d ( mv ) mv 1 mv 2 F dt t 1 t 2 = ( mv ) 2 ( mv ) 1 Mass is often non-constant Linear Momentum (L ) • Define L = mv F dt t 1 t 2 = L 2 L 1 = Δ L F dt t 1 t 2 = ( mv ) 2 ( mv ) 1 Linear Impulse ( LI ) LI 1-2 = F t 1 t 2 dt • Define LI 1-2 = ( mv ) 2 ( mv ) 1 F dt t 1 t 2 = ( mv ) 2 ( mv ) 1
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2 Impulse-Momentum linear impulse = change in linear momentum
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This note was uploaded on 09/19/2009 for the course ME 242 taught by Professor Kam during the Spring '06 term at Nevada.

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ME 242 Lecture 12 02.18 - ME 242 Dynamics February 18, 2009...

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