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# lec13 - 13-1Physics IClass 13GeneralRotational MotionRev...

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Unformatted text preview: 13-1Physics IClass 13GeneralRotational MotionRev. 19-Feb-06 GB13-2DefinitionsAngular Position:θ(normally in radians)Angular Displacement:θ-θ=θ∆Average or mean angular velocity is defined as follows:tttavg∆θ∆≡-θ-θ≡ϖInstantaneous angular velocity or just “ angular velocity”:tddtlimtθ≡∆θ∆≡ϖ→∆Wait a minute! How can an angle have a vector direction?13-3Direction of Angular Displacement and Angular Velocity•Use your right hand.•Curl your fingers in the direction of the rotation.•Out-stretched thumb points in the direction of the angular velocity.13-4Angular AccelerationAverage angular acceleration is defined as follows:tttavg∆ϖ∆≡-ϖ-ϖ≡αInstantaneous angular acceleration or just “angular acceleration”:22ttddtddtlimθ≡ϖ≡∆ϖ∆≡α→∆The easiest way to get the direction of the angular acceleration isto determine the direction of the angular velocity and then…•If the object is speeding up, angular velocity and accelerationare in the same direction....
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lec13 - 13-1Physics IClass 13GeneralRotational MotionRev...

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