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MP #8

# MP #8 - Print View Class PH1110A2007 Assignment 8 Due at...

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1 of 10 [ Print View ] Class PH1110A2007 Assignment 8 Due at 5:00pm on Monday, September 17, 2007 View Grading Details All Work and No Play 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. Part A What can be said about the sign of the work done by the force ? ANSWER: It is positive. It is negative. It is zero. There is not enough information to answer the question. When , the cosine of is zero, and therefore the work done is zero. Part B What can be said about the work done by force ? ANSWER: It is positive.

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2 of 10 It is negative. It is zero. When , is positive, and so the work done is positive. Part C The work done by force is ANSWER: positive negative zero When , is negative, and so the work done is negative. Part D The work done by force is ANSWER: positive negative zero Part E The work done by force is ANSWER: 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 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.

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