Lecture13-15_1p

# Lecture13-15_1p - Lecture 13: based on G: chapter 5 Uniform...

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Uniform Circular Motion (Kinematics and Dynamics) Solving problems/clicker questions Lecture 13: based on G: chapter 5 107

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Uniform Circular Motion is a motion in a circle of constant radius at constant speed . 108
Uniform Circular Motion Instantaneous velocity is always tangent to circle. is a motion in a circle of constant radius at constant speed . Acceleration points towards the center of the circle and is called the centripetal , or radial , acceleration: 109

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Centripetal Acceleration similar triangles for infinitesimal time interval: 110
Useful formulas for uniform circular motion: Period is the time required for one complete revolution Frequency is the number of revolutions per second. Speed is given by the circumference divided by the period: Radial acceleration: 111

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Dynamics of Uniform Circular Motion: For an object to be in uniform circular motion, there must be a net force acting on it. Newton’s 2nd law: Force points towards the center of the circle! There is no centrifugal force! 112
113

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Highway Curves Non-uniform Circular Motion Centrifugation Solving problems/clicker questions Lecture 14: based on G: chapter 5 115

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Highway Curves When a car goes around a curve , there must be a net force towards the center of the circle of which the curve is an arc. If the road is flat, that force is
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## Lecture13-15_1p - Lecture 13: based on G: chapter 5 Uniform...

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