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Course: PHYS 18, Spring 2008
School: UC Irvine
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Word Count: 203

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4 Week Homework Due April 28. 1. The top figure on the next page shows snapshots of a golf swing taken at regular intervals. Call the forward direction of the swing the positive direction for increasing angle. (a) When is the angular velocity largest? Explain. (b) When is the angular acceleration negative? Explain. (c) When is the angular displacement largest? Explain. 2. For circular motion, the velocity of the...

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4 Week Homework Due April 28. 1. The top figure on the next page shows snapshots of a golf swing taken at regular intervals. Call the forward direction of the swing the positive direction for increasing angle. (a) When is the angular velocity largest? Explain. (b) When is the angular acceleration negative? Explain. (c) When is the angular displacement largest? Explain. 2. For circular motion, the velocity of the object is v = r. Find this equation in your textbook. How is r increased in the field event Hay discusses? How is increased? 3. A cyclist rides in circles on a level parking lot. What type of force (gravity, friction, normal, ...) provides the centripetal acceleration? 4. Give an example of a sport where the buoyant force is used to reduce drag. 5. The drag force is F = CA(v2 /2). Give sports examples that illustrate the importance of each of the four terms on the right-hand side of this equation (a total of four examples). 6. Hay discusses the use of topspin to curve a ball downward in chapter 7. Which sports does he mention in this context? Week 5 Warmup Question Submit answer by midnight Sunday April 27. 1. Warmup question for May 3. How do athletes in extreme sports like skateboarding and BMX get so high? 1 2
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