09Lecture_5 - P1112 Lecture 5 Agenda for today Homework...

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1 P1112 Lecture 5 Agenda for today • Homework Issues • Monkey and Zookeeper • Uniform circular motion
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2 Problem: Monkey and Zookeeper You need to reach a monkey on a tree with a tranquilizer dart You know that the moment you fire the gun the monkey will decide to drop from the tree Where should you aim the gun (A) Directly at the initial position of the monkey (B) Below that
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6 Motion in a circle with: – constant radius R – constant speed v = | v | – r(t) and v(t) are rotating vectors – Is the velocity constant? What is Uniform Circular Motion?
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7 Uniform circular motion • Velocity changes direction, magnitude stays the same. There must be an acceleration! • Remember definition of average acceleration: r a av ( t ) = r v 2 " r v 1 t 2 " t 1 r a ( t ) = lim # t $ 0 # r v # t R v 2 v 1
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Uniform circular motion • Direction of acceleration a is pointing toward the center of the circle • Anything we can say about the magnitude of a ? r
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09Lecture_5 - P1112 Lecture 5 Agenda for today Homework...

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