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Published byJourney Lantry Modified over 4 years ago

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Rotational Energy and Momentum Rotational contribution to Energy Examples –Rolling down incline –Atwoods Machine again Rotational Energy vs. Angular Momentum Angular Momentum Conservation of Angular Momentum Examples –Colliding disks –One object changing Rotational Inertia –Colliding point objects and disks

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Rotational energy contribution r1r1 m1m1 m2m2 r2r2

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Example - Rotational energy contribution

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Procession of Objects For objects rolling down incline plane (reminds me of) Higher moments of inertia

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Review - Atwoods Machine with Pulley

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Atwoods Machine with Pulley (Energy)

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Rotational Energy and Angular Momentum

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Angular momentum

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Type 1 - Two identical disks

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Type 1 – Disk and rod

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Type 2 – Person on Platform

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Type 2 – Figure Skater

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Type 2 – Person on Stool

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Type 2 – Example 8-15

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Type 2 – Walking on Merry-Go Round

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Type 3 – Linear collision with Disk

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Type 3 – Collision with Asteroid

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Collision with Asteroid (cont) Asteroid =100 tonne

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Angular Momentum - Vector Bicycle Wheel Stability of Bicycle Gyroscope Crossing stream on narrow log Polanowskis story

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Summary - Translation vs. Rotation

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Translation vs. Rotation (cont)

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L-11 Rotational Inertia Why is a bicycle stable (it doesn’t fall over) only when it is moving? Rotational (angular) Momentum Conservation of angular momentum.

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