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Unformatted text preview: Analogous to the main concepts in linear mo;on 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 • More About Radians • Comparing degrees and radians • Conver;ng from degrees to radians Angular Displacement • Axis of rota;on is the center of the disk • Need a ﬁxed reference line • During ;me t, the reference line moves through angle θ • The angle, θ, measured in radians, is the angular posi2on Rigid Body • Every point on the object undergoes circular mo;on about the point O • All parts of the object of the body rotate through the same angle during the same ;me • The object is considered to be a rigid body – This means that each part of the body is ﬁxed in posi;on rela;ve to all other parts of the body Angular Displacement, cont. • The angular displacement is deﬁned as the angle the object rotates through during some ;me interval • • The unit of angular displacement is the radian • Each point on the object undergoes the same angular displacement Average Angular Speed • The average angular speed, ω, of a rota;ng rigid object is the ra;o of the angular displacement to the ;me interval Angular Speed, cont. • The...
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This document was uploaded on 01/14/2014.
 Winter '14
 Momentum

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