Lecture 12

# Lecture 12 - Lecture 12 pls-12.1 Uniform Circular Motion...

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Lecture 12 pls-12.1 Uniform Circular Motion Media: 1. Video 2. Foam Ball on String 3. Web Site with Carousel Clicker questions 1 and 2 . 1. Kinematics (Position, Velocity, Acceleration) Uniform constant speed. Constant speed motion in a circle. Examples?? Any rides at Lagoon? Pay money Æ interesting! A. Position. The position (vector) traces out a circle. Convenient to put the origin at the center of the circle. B. Velocity . Look near top of circle. 2 1 r r r v r r = + Æ 1 2 r r r r v r = Average v r between 1 r r and 2 r r : t r v r r = Æ v r is parallel to r r . Æ at the top of the circle v r points to the right; tangent to circle. 1 r r 3 r r 2 r r 1 v r 3 v r 2 v r 1 r r 2 r r r r

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Lecture 12 pls-12.2 Demo : Foam Ball on String, Video Generalization : v r is always tangent to the path of the object. Is v r constant? No! It is continually changing direction . Changing v r Æ nonzero a r . C.
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Lecture 12 - Lecture 12 pls-12.1 Uniform Circular Motion...

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