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Unformatted text preview: L ECTURE 14: A NGULAR M OMENTUM Rotational dynamics (review) Conservation of angular momentum Altering total I Altering which parts rotate Turning without any initial L Rotational energy Kinetic energy Work 1) The formula for angular momentum is a) m v b) I 2 c) I d) t a) None of these Translational/Rotational Analogs Translational Rotational Mass m Rotational inertia I Position x , y , ... Angle , ... Velocity v Angular velocity Acceleration a Angular acceleration Force F Torque Momentum p = mv Angular momentum L = I Kinetic energy 1 2 mv 2 Kinetic energy 1 2 I 2 Work Fx Work Recall cannon demonstration: Linear momentum is conserved in an isolated system Halliday & Resnick. Conservation of Momentum in Riflery Hewitt. Angular momentum is conserved in isolated systems Hewitt Diving example: There are no external torques once the diver leaves the board so L is conserved Hay L is conserved during the jump: must adjust I to alter Hay. Bicycle wheel demonstration: changing which part rotates Benson. Changing which part rotates: diving example Hay. Changing which part rotates: ski jump example Dyson. Tour en lair example: Large torque on takeoff plus upper/lower body adjustments Dyson. Demonstration: Turning with no initial angular momentum Dyson. Demonstration: Turning with no initial angular momentum Hay. Extreme example of turning without initial L Dyson Turning requires flexibility Dyson. Rotational motion has kinetic energy...
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 Fall '08
 Mcwilliams,R
 Physics, Angular Momentum, Energy, Kinetic Energy, Momentum, Work

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