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Unformatted text preview: 10/11/2009 1 Chapter 7. Rotational motion t t i f 2 2 1 2 2 2 i i i t t t r a r v r s t 2 2 r r v a c • Linear motion: position x changes with respect to time- (linear) displacement: • Rotational motion: Angle changes with respect to time- Angular displacement: • The radian : The radian is a unit of angular measure • The radian can be defined as the arc length s along a circle divided by the radius r Comparing degrees and radians i f x x x i f r s o 3 . 57 2 360 rad 1 o 10/11/2009 2 Rigid body Every point on the object undergoes circular motion about the point O All parts of the object of the body rotate through the same angle during the same time Axis of rotation is the center of the disk Angular displacement Each point on the object undergoes the same angular displacement i f Average angular speed, ω Instantaneous angular speed Average angular acceleration Instantaneous angular acceleration rad/s) : Unit ( t t t i f i f av...
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- Spring '08
- Physics, Rotation, Radian, rad/s