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Unformatted text preview: When a rigid body rotates about a fixed axis, the angular displacement is the angle swept out by a line passing through any point on the body and intersecting the axis of rotation perpendicularly. The radian (rad) is the SI unit of angular displacement . In radians, the angle is defined as the circular arc length s traveled by a point on the rotating body divided by the radial distance r of the point from the axis: = s / r . The average angular velocity is the angular displacement divided by the elapsed time t : = / t . As t approaches zero, the average angular velocity becomes equal to the instantaneous angular velocity . The magnitude of the instantaneous angular velocity is called the instantaneous angular speed. The average angular acceleration is the change in the angular velocity divided by the elapsed time t : = / t . As t approaches zero, the average angular acceleration becomes equal to the instantaneous angular acceleration...
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This note was uploaded on 04/09/2008 for the course PHYS 101 taught by Professor Sharp during the Spring '08 term at Ohio State.
 Spring '08
 Sharp

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