Lecture 12

Lecture 12 - Today Physics 231 General University Physics...

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1 Physics 231 General University Physics Spring 2007 Lecture 12 Today ± Uniform Circular Motion ² Kinematics ² Dynamics ± Horizontal Circle Quiz: A car rounds a curve while maintaining a constant speed. Is there a net force on the car as it rounds the curve? No, i t s .. Y es It de p e n . 11% 1% 88% 1. No, its speed is constant. 2. Yes 3. It depends on the sharpness of the curve and the speed of the car. Uniform Circular Motion ± Uniform circular motion occurs when an object moves in a circular path with a constant speed ± An acceleration exists since the direction of the motion is changing ± This change in velocity is related to an acceleration ± The velocity vector is always tangent to the path of the object Motion Diagram for Circular Motion Direction of Acceleration ± Demo: Arrows on Rotating Turntable ± Demo: Linear Accelerameter ± Video: (Mech. Univ. #9.23/25) Kinematics of Circular Motion
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2 Changing Velocity in Uniform Circular Motion ± The change in the velocity vector is due to the change in direction ± The two triangles are similar so // vt rt vr ΔΔ ΔΔ = Centripetal Acceleration ± The acceleration is always perpendicular to the path of the motion ² For circular motion with constant speed
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This note was uploaded on 11/16/2010 for the course PHY 231 taught by Professor Ellis during the Spring '08 term at Kentucky.

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Lecture 12 - Today Physics 231 General University Physics...

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