lec13 - L ECTURE 13: F LEXIBLE BODIES AND R OTATIONAL D...

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Unformatted text preview: L ECTURE 13: F LEXIBLE BODIES AND R OTATIONAL D YNAMICS Center of gravity (center of mass) Rotational inertia (moment of inertia) Rotational dynamics For translational motion and calculating torques, the mass of a ruler acts as if it were concentrated at a single point Hewitt The center of mass isnt necessarily where there is any real mass Hay/Hewitt A flexible body can adjust the position of its center of mass Hay Even if the motion looks complicated, the center of mass of the projectile follows a parabolic trajectory Hewitt The reach is higher even though the center of mass is not Hay In high jump, the hips are higher than the cg Hay. How does a ballerina manage to have her head float at the same height for a long time when she performs a grand jete ? 1) When a ballerina performs a grand jete, she has to push the floor hard in order to get enough height, because height determines the hang time....
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This note was uploaded on 12/12/2011 for the course PHYS 17 taught by Professor Mcwilliams,r during the Fall '08 term at UC Irvine.

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lec13 - L ECTURE 13: F LEXIBLE BODIES AND R OTATIONAL D...

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