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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 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 Hookes 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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