The sign of angular velocity follows that of angular displacement: positive for
counterclockwise rotation and negative for clockwise rotation. The magnitude (absolute
value) of angular velocity is angular speed.Ȧ = instantaneous angular velocity
ș = angular position
ǻș = angular displacement
ǻt = elapsed time
Units: rad/s
The motorcycle rider takes two
seconds for a counterclockwise
lap around the track. What is her
average angular velocity?
(^178) Copyright 2007 Kinetic Books Co. Chapter 09