p201f08hw05aa - MasteringPhysics: Assignment Print View...

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IUPhysicsP201F2009 Assignment 5a Due at 11:00pm on Tuesday, September 30, 2008 Assignment Display Mode: View Printable Answers View Grading Details All Work and No Play Description: Several conceptual and computational questions: Given force and displacement, what is the work done? Learning Goal: To be able to calculate work done by a constant force directed at different angles relative to displacement If an object undergoes displacement while being acted upon by a force (or several forces), it is said that work is being done on the object. If the object is moving in a straight line and the displacement and the force are known, the work done by the force can be calculated as , where is the work done by force on the object that undergoes displacement directed at angle relative to . Note that depending on the value of , the work done can be positive, negative, or zero. In this problem, you will practice calculating work done on an object moving in a straight line. The first series of questions is related to the accompanying figure. Page 1 of 12 MasteringPhysics: Assignment Print View 9/17/2008 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1144576
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Part A What can be said about the sign of the work done by the force ? When , the cosine of is zero, and therefore the work done is zero. ANSWER: It is positive. It is negative. It is zero. There is not enough information to answer the question. Part B What can be said about the work done by force ? When , is positive, and so the work done is positive. ANSWER: It is positive. It is negative. It is zero. Part C The work done by force is When , is negative, and so the work done is negative. ANSWER: positive negative zero Part D The work done by force is ANSWER: positive negative zero Part E The work done by force is ANSWER: Page 2 of 12 MasteringPhysics: Assignment Print View 9/17/2008 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1144576
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In the next series of questions, you will use the formula to calculate the work done by various forces on an object that moves 160 meters to the right. positive negative zero Part F The work done by force is ANSWER: positive negative zero Part G The work done by force is ANSWER: positive negative zero Part H Find the work done by the 18-newton force. Use two significant figures in your answer. Express your answer in joules. ANSWER: Page 3 of 12 MasteringPhysics: Assignment Print View 9/17/2008 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1144576
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= Part I Find the work done by the 30-newton force. Use two significant figures in your answer. Express your answer in joules. ANSWER: = Part J Find the work done by the 12-newton force. Use two significant figures in your answer. Express your answer in joules.
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p201f08hw05aa - MasteringPhysics: Assignment Print View...

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