Unformatted text preview: Δ θ in a time interval Δ t , its average angular velocity ω avg is (105) The (instantaneous) angular velocity ω of the body is (106) Both ω avg and ω are vectors, with directions given by the righthand rule of Fig. 106. They are positive for counterclockwise rotation and negative for clockwise rotation. The magnitude of the body's angular velocity is the angular speed . Angular Acceleration If the angular velocity of a body changes from ω 1 to ω 2 in a time interval Δ t = t 2 t 1 , the average angular acceleration α avg of the body is (107) The (instantaneous) angular acceleration α of the body is (108) Page 1 of 1 Review & Summary 12/23/2010 http://edugen.wiley.com/edugen/courses/crs4957/halliday9118/halliday9118c10/aGFsbGl. .....
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 Fall '07
 Griffo
 Angular velocity, Radian, Δθ

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