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revwk6f09 - October 5 th-October 6 th 2009 PHY 2048...

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Unformatted text preview: October 5 th-October 6 th , 2009 PHY 2048 Discussion Fall ’09 Conceptual Review: Chapter 7.1-8.4 A . Work & Kinetic Energy 1. A boy pushes a wall with a force of 50 N for 10 s. What is the work done on the wall by the boy? 2. A girl is pulling a sledge with a string. The string makes angle θ to the horizontal. What is the work done by the girl during the sledge moves over a distance d. B. Work Done by Gravity & Gravitational Potential Energy 1. Write down the definition of the work done by gravity and gravitational potential energy. 2. Does the work done by gravity change if you change the path of the motion? C. Work Done by Spring & Spring potential Energy 1. Write down Hooke’s law. 2. What is the work done by spring and spring potential energy? D. Power 1. Write down the definition of power and the SI unit for it. October 5 th-October 6 th , 2009 PHY 2048 Discussion Fall ‘09 Practice Exam Problems (Chapter 7.1-8.4) 1. A man pushes an 80-N crate a distance of 5.0 m upward along a frictionless slope that makes an angle 1....
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revwk6f09 - October 5 th-October 6 th 2009 PHY 2048...

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