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Chapters 9 & 10

# Chapters 9 & 10 - Rotation and angles Chapters 9 and 10...

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1 Chapters 9 and 10: Rotational Motion We’ve considered the physics of the motion of particles , and the motion of the center of mass of extended objects. But extended objects can also rotate about an axis. Rotation and angles Think about a rigid body that rotates about a fixed axis . First, we need to sort out a better ‘unit’ for angles We’ve been using degrees [0:360], but there is a better ‘unit’ we can use called radians 1 radian is defined as the angle subtended at the center of a circle by an arc with length equal to the radius of the circle all round the circle, 1 rad = 57.3 o Angular velocity Define an angular velocity as the rate of change of an angle units are radians/second who has the larger angular velocity, the boy or the girl? boy girl Angular acceleration Define an angular acceleration as the rate of change of the angular velocity units are radians/second 2

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