prac-test-w-en-power-grav - Practice Test Work, Energy,...

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Practice Test Work, Energy, Power, and Gravitation Multiple Choice Identify the choice that best completes the statement or answers the question. 1. In which of the following sentences is work used in the everyday sense of the word? a. Lifting a heavy bucket involves doing work on the bucket. b. The force of friction usually does negative work. c. Sam and Rachel worked hard pushing the car. d. Work is a physical quantity. 2. Work is done when a. the displacement is not zero. b. the displacement is zero. c. the force is zero. d. the force and displacement are perpendicular. 3. What is the common formula for work? Assume that W is the work, F is a constant force, v is the change in velocity, and d is the displacement. a. W = F v b. W = Fd c. W = Fd d. W = F d 4. If the sign of work is negative, a. the displacement is perpendicular to the force. b. the displacement is in the direction opposite the force. c. the displacement is in the same direction as the force. d. no work is done. 5. In which of the following scenarios is work done? a. A weightlifter holds a barbell overhead for 2.5 s. b. A construction worker carries a heavy beam while walking at constant speed along a flat surface. c. A car decelerates while traveling on a flat stretch of road. d. A student holds a spring in a compressed position. 6. In which of the following scenarios is no net work done? a. A car accelerates down a hill. b. A car travels at constant speed on a flat road. c. A car decelerates on a flat road. d. A car decelerates as it travels up a hill. 7. A worker does 25 J of work lifting a bucket, then sets the bucket back down in the same place. What is the total net work done on the bucket? a. –25 J b. 0 J c. 25 J d. 50 J 8. A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60 ° below horizontal. How much work does the child do on the balloon? a. –10 J b. –6.0 J c. 6.0 J d. 12 J 9. How much elastic potential energy is stored in a bungee cord with a spring constant of 10.0 N/m when the cord is stretched 2.00 m? a. 10.0 J b. 20.0 J c. 40.0 J d. 200 J 10. Which of the following is a true statement about the conservation of energy? a. Potential energy is always conserved. b. Kinetic energy is always conserved. c. Mechanical energy is always conserved. d. Total energy is always conserved. 11. In the presence of frictional force,
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a. nonmechanical energy is negligible and mechanical energy is no longer conserved. b. nonmechanical energy is negligible and mechanical energy is conserved. c. nonmechanical energy is no longer negligible and mechanical energy is conserved. d. nonmechanical energy is no longer negligible and mechanical energy is no longer conserved. 12.
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This note was uploaded on 11/18/2010 for the course CPHY 101 taught by Professor Jay during the Spring '10 term at University of Massachusetts Boston.

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prac-test-w-en-power-grav - Practice Test Work, Energy,...

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