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ME 242 Lecture 15 03.02

# ME 242 Lecture 15 03.02 - ME 242 Dynamics March 2 2009...

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1 ME 242 Dynamics March 2, 2009 Eric Wang Today’s Key Concepts Impact (collisions) • Impulse-Momentum • Conservation of Momentum • Coefficient of Restitution 600 foot Descender 400 foot Bungee Jump 100 foot Rock Climbing 50 foot Vine Jump

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2 Linear Impulses Vine Rock Climbing Bungee Time Force F dt t 1 t 2 = ( mv ) 2 ( mv ) 1 Descender Impact Impact Vine Rock Climbing Bungee Time Descender Usually ignore the impulse due to all non-impact forces (e.g. gravity) during an impact F dt t 1 t 2 2 Particle Impact Before During After v A v B v A v B A B A B A B LI 1-2 = F BA dt + F AB dt = 0 If we ignore the non-impact forces: 2 Particle Impact • Given initial velocities & masses • Conservation of momentum: • Energy is not conserved (usually) • Individual momenta change • System momentum is constant • 1 equation, 2 unknowns (final velocities) m A v A + m B v B = m A v A + m B v B Coefficient of Restitution • Equation that relates relative
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ME 242 Lecture 15 03.02 - ME 242 Dynamics March 2 2009...

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