11_01_Rotation - h R T g S R T g S Let’s look at energy...

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11/1 Rotational Energy / Presentation “Off to the Races” / Upcoming presenters please see me / Pendulum and Block, will collect Thursday Cancel text prob (7-39) with my apologies / Bowling Ball Race? / HW None assigned today / Guidance Center: 2-3:30 no staff Katie at 3:30-5:30
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Off to the Races. Example Races Not the same velocity at the bottom! Let’s look at energy of a non-rotating block. h R T g S R T g S 0 0 0 0 0 Let’s look at energy of a rotating ring. h R T g S R T g S ? ? 0 0 0 0 0 0
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Ring rolling without slipping No slipping Not quite Same distance, same time so. .. v B = v A Mass of ring = m KE T = 1 / 2 mv B 2 KE R = 1 / 2 mv A 2 KE R = ? KE T = KE R A B
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Off to the Races. Example Races Not the same velocity at the bottom! Let’s look at energy of a non-rotating block.
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Unformatted text preview: h R T g S R T g S Let’s look at energy of a rotating ring. h R T g S R T g S KE T = KE R Must be a 50/50 slit of the PE g Off to the Races. Example Races Not the same velocity at the bottom! Let’s look at energy of a rotating ring. h R T g S R T g S KE T = KE R Must be a 50/50 slit of the PE g h R T g S KE T = KE R 50/50 slit of the Pe g ? Compare this to a solid cylinder of the same mass. ? ? Faster!! KE T is bigger! R T g S Off to the Races. All the mass moving at v R All the mass moving at v R ? No! Slower toward the center....
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This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Fall '08 term at North Dakota.

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11_01_Rotation - h R T g S R T g S Let’s look at energy...

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