# lec7 - L ECTURE 7 R OTATIONAL K INEMATICS DESCRIBING...

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L ECTURE 7: R OTATIONAL K INEMATICS ( DESCRIBING ANGULAR MOTION ) Angular motion Circular motion Centripetal/centrifugal force Combined translational and rotational motion Decomposition Spin

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Units of angular displacement 1. A basketball announcer says “Dribbles down the court, makes a 360-turn, and lays it in.” What units for angular motion are used? (a) revolutions (b) degrees (c) radians 2. A diving announcer says “She’ll be performing a 1 1 2 pike.” What units for angular motion are used? (a) revolutions (b) degrees (c) radians
Angular velocity is a vector with a direction Hay

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What direction is this rotation? Hay
Two angular directions are involved here Hay

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Angular velocity vectors add like other vectors Hay
An example of angular acceleration Hay.

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Translational and Angular Motion are Analogous Hay
3. Where is the angular speed greatest? (a) At the top (b) At the bottom (c) Horizontally to the right (d) Horizontally to the left (e) None of these Hay

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(a) Up
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## This note was uploaded on 12/12/2011 for the course PHYS 17 taught by Professor Mcwilliams,r during the Fall '08 term at UC Irvine.

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lec7 - L ECTURE 7 R OTATIONAL K INEMATICS DESCRIBING...

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