hmwk5 - F . In the section of the textbook entitled...

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Week 5 Homework Due May 6. 1. Work (a) Give a sports example of positive work. (b) Give a sports example of something that is tiring but does not in- volve work. (c) Give a sports example where the force and motion are not parallel, so only the parallel component of the force contributes to the work. 2. Examine Table 5.1 of the Lecture #9 lecture notes. (In each case, answer with a pair of objects from the table.) (a) What has a larger kinetic energy because it has a larger mass (even though it is slower)? (b) What has a larger kinetic energy because it has a larger speed (even though it is lighter)? 3. Examine Figure 5-18 in light of the principle of conservation of energy. When is the total energy of the gymnast conserved? When the gymnast loses energy, where does the “lost” energy go? 4. When we discussed damage in class a few weeks ago, we learned that increasing the time Δ t of a collision reduces the force
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Unformatted text preview: F . In the section of the textbook entitled Work-Energy Relationship, Hay explains how to avoid injury from a different perspective. (a) What quantity does Hay say to increase in order to reduce the force? (b) Does increasing this also increase t ? Explain. (c) What is one of the sports examples Hay uses to illustrate this prin-ciple? Week 6 Warmup Questions Submit answers by midnight Sunday May 4. 1. Warmup questions for May 6. (a) Why do triathletes load up on carbo-hydrates, while sprinters dont bother? (b) Professional hockey players only skate about 25% of the time while athletes in other strenuous sports like soccer play continuously. Why do hockey players need so much rest? 2. Warmup question for May 8. In racketball, backspin makes the ball drop down from the wall faster. How does this work? 1...
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