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Class 9

# Class 9 - Engineers Without Borders Freshmen Leadership...

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Engineers Without Borders Freshmen Leadership Board Monday, 9/26, 7 pm Lind 5 General Chapter Meeting Wednesday, 9/28, 7 pm Tate 133 • Get involved with a student group engineering sustainable solutions in international partner communities Leadership positions Resume builder Meet people Have fun! You Decide

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2 Kinematics of Circular Motion Physics 1301, Fall 2011: Class 9 Wednesday, September 21, 2011
3 Objectives: Wednesday, September 21 Kinematics of Circular Motion Angular Displacement, velocity, acceleration Problems in angular kinematics

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4 Demonstrations 1d10.20 Cycloid generator 1d10.40 Mounted wheel 1d10.50 Ball on edge of disk 1d10.65 LEDs on turntable 1d50.10 Ball on a string
Kinematics of Circular Motion So far, we have described linear motion in 1, 2 and 3 dimensions using vectors (arrows) An important class of motion is circular, as contrasted to linear We can also represent circular kinematic quantities using vectors The circular displacement vector points along the axis of rotation . The direction of the rotation is given by right-hand rule . 5

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Circular Kinematic Variables The circular kinematic variables are: Angular displacement (radians) Angular velocity (radians/s) Angular acceleration (radians/s 2 ) 6 θ , ω and α ω = d θ dt , α = d ω dt = d 2 θ dt 2
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