11_26_Ang_Mom - 11/26 Wheel of Death Presentation Angular...

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11/26 Wheel of Death / Presentation “Angular Momentum” / HW “Angular Momentum” Due Thursday 11/29 / Begin Simple Harmonic Motion (SHM) Wednesday / Exam IV Thursday Eve 12/6 5-7 Wit 116
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Wheel of Death Serious Injury Let go of the wheel and what happens?
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Wheel of Death Serious Injury Now what happens? Spinning wheel rotates around rope! CM T R, Wheel o’Death W E,Wheel o’Death Torque -- no matter which axis ϖ
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Wheel of Death Serious Injury Now what happens? Spinning wheel rotates around rope! Top View Torque and α ϖ
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Angular Momentum / uses the symbol L / given by L = I ϖ (recall p = mv) / L conserved if net external torque = 0 (p conserved if net external force = 0)
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ϖ Disk spinning on a frictionless axle. Any external torque? There are external forces, W E,D and N A,D , but they do not produce any torque. Angular momentum is conserved, ( ϖ doesn’t change). A hand touches the disk. Any external torque? Yes, f
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11_26_Ang_Mom - 11/26 Wheel of Death Presentation Angular...

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