Chapter5test (dragged)

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Name:______________________________Class:__________________ Date:__________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Physics 1 Chapter Tests Assessment Chapter Test A Teacher Notes and Answers Work and Energy CHAPTER TEST A (G ENERAL ) 1. c 2. c 3. b 4. a 5. b 6. c 7. b 8. d 9. b 10. c 11. d 12. b 13. d 14. d 15. d 16. d 17. c 18. c 19. d 20. b 21. The net work is zero (because the net force on the car is zero). 22. The net work done by the net force acting on an object is equal to the change in the kinetic energy of the object. 23. 5.0 J 24. 215 J Given F = 43.0 N d = 5.00 m Solution W = Fd = (43.0 N)(5.00 M) = 215 J 25. 2.5 kW Given m = 250 kg d = 2.0 m ± t = 2.0 s g = 9.81 m/s 2 Solution P = W ± t = Fd ± t = mgd ± t = (250 kg)(9.81 m/s 2 )(2.0 m) 2.0 s = 2.5 ² 10 3 W = 2.5 kW
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