ef152-lec-1-4

# ef152-lec-1-4 - Module 1 Lecture 4 Angular Momentum Vector...

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EF 152 Spring, 2009 Lecture 1-4 1 Module 1, Lecture 4 Angular Momentum Vector Cross Product EF 152 Spring, 2009 Lecture 1-4 2 Review: Fun with Clickers How is momentum calculated? A. 0.5mv 2 B. ma C. mv D. I ω Momentum is a: A. Scalar B. Vector When did conservation of momentum apply? A. Always B. No external forces C. Only in elastic collisions D. Only on Wednesdays What is d(mv)/dt ? A. Force B. Acceleration C. Impulse D. Torque EF 152 Spring, 2009 Lecture 1-4 3 Angular Momentum Objects rotating about a fixed axis Can relate to Newton’s second law Conservation of momentum Total angular momentum remains __________ if net external torque acting on system is ______. Units: ω I L = dt L d = τ EF 152 Spring, 2009 Lecture 1-4 4 Example: Clutch Given: In a clutch, a disc with I = 1.2 kg-m 2 is brought into contact with a spinning flywheel having I = 1.8 kg-m 2 and ω = 72 rad/s. Required: Angular velocity after the disc is moving with the flywheel. A. 28.8 rad/s B. 43.2 rad/s C. 72.0 rad/s D. 108 rad/s

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EF 152 Spring, 2009 Lecture 1-4 5 Example: Circular platform, part I
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