advertisement

Name _____________________________ Date ___________ Period ____ Practice Test: Energy, Work and Power Matching: Match the following vocabulary terms with the proper metric unit of measurement. Answers may be used more than once. _______1. _______2. _______3. _______4. time distance height Speed a. b. c. d. meters kilometers meters/second second Matching: Match the following forms of energy with the proper source for each. (Think of where each comes from) _______5. thermal or heat energy _______6. electrical energy _______7. chemical energy _______8. nuclear energy _______9. mechanical energy a. a windmill b. the sun c. a battery d. friction e. a TV Written Section: (Hint – in the problems a bolded unit usually means a conversion.) 10. Identify the energy conversions present as a log burns. 11. You lift a 60 N toy to put it on a shelf that is 1.4 m off of the ground. Calculate the amount of work you did. Identify the equation(s): Identify the variables: Answer: Show work: 12. A crane does 14,300 J of work to lift a beam. It takes the crane 85.0 seconds to complete that process. Calculate the power. Identify the equation(s): Show work: Identify the variables: Answer: 13. An 75.0 W light bulb burns for 24.3 minutes. Calculate the amount of energy (work) produced? Identify the equation(s): Show work: Identify the variables: Answer: 14. A machine can output 420 W. How long would it take the machine to accomplish 4,500 J of work? Identify the equation(s): Show work: Identify the variables: Answer: 15. A tennis ball is hit and travels 42 m/s. If the tennis ball has a mass of 0.290 kg, calculate the kinetic energy of the ball. Identify the equation(s): Identify the variables: Answer: Show work: 16. A 1.93 kg can sits on a shelf 1.6 m off the ground at Wal-Mart. Calculate the potential energy of the can. Identify the equation(s): Show work: Identify the variables: Answer: 17. The can from the previous problem falls. Calculate the speed (velocity) of the can when it hits the ground below. Identify the equation(s): Identify the variables: Answer: Helpful Equations: Ek = ½ mv2 Eg = mgh g = 9.81 m/s2 P = W/t W = Fd Eg = Fh Show work: