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prac-test-w-en-power-grav

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

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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 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, displacement is in the same direction as the force. 5. In which of the following scenarios is work done? at constant speed along a flat surface. 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? 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? 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? 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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negligible and mechanical energy is conserved. energy is conserved. conserved. 12. Why doesn’t the principle of mechanical energy conservation hold in situations when frictional forces are present? a. Kinetic energy is not completely converted to a form of potential energy. b. Potential energy is completely converted to a form of gravitational energy. c. Chemical energy is not completely converted to electrical energy.
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