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L34 - Remember:ThisWeek Mid-Term Exam#3 solutions on...

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Remember: This Week Mid-Term Exam #3: solutions on CULearn. Grades posted as soon as they come in. Will be “curved” as usual. CAPA assignment #12 is due Friday evening at 10 PM, to be done on-line. Lab 5: Spring and Things. Do Pre-Lab on-line, print, and also print out lab manual. Read Ch. 9: Statics & Static Equilibrium. Also finish Ch. 8 on angular momentum. L34 W 4/7/10 1 Physics 2010

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L34 W 4/7/10 Physics 2010 2 Angular Momentum and its Conservation Recall: momentum p = mv L = I ω angular momentum relation to force F = Δ p/ Δ t τ = Δ L/ Δ t relation to torque no external force Δ p = 0 Δ L = 0 no external torque (momentum is conserved) (angular momentum is conserved) I i ω i = I f ω f
L34 W 4/7/10 Physics 2010 3 Angular Momentum and its Conservation L = I ω τ = Δ L Δ t I i ω i = I f ω f (if F ext = 0) I i ω i = I f ω f ω f = I i I f ω i > ω i I i large ω i small I i small ω i large By changing the distribution of mass, the moment of inertia is changed. By conservation of angular momentum, the angular velocity is therefore modified. Conservation of L:

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L34 W 4/7/10 Physics 2010 4 Angular Momentum and its Conservation L = I ω τ = Δ L Δ t I i ω i = I f ω f (if F ext = 0) I i large ω i small By changing the distribution of mass, the moment of inertia is changed. By conservation of angular momentum, the angular velocity is therefore modified.
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