Teacher Version. Winnetonka 9th Grade Physics: Work, Energy, Power
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1 Teacher Version Winnetonka 9th Grade Physics: Work, Energy, Power
2 1. What is the formula to calculate work? a. w =!! b. w = F d c. w =!! d. w = F t 2. When force increases, distance stays the same, work. 3. When distance increases, force stays the same, work. 4. What is the S.I. unit for work? a. Watt b. Meter c. Newton d. Joule 5. How much work does it take to lift a 10 N rock a distance of 3 meters? a. 3.3 W b. 30 W c. 3.3 J d. 30 J 6. How much more work is done lifting a twice as heavy rock twice as far? a. 0 b. Two times as much c. Four times as much d. Eight times as much 7. Which of the following is NOT an example of work? a. A teacher applies a force to a wall and becomes exhausted. b. A book falls off of a table and free falls to the ground. c. A rocket accelerates through space. d. An athlete picks up and raises a rock above her head.
3 8. Use the diagram below to calculate the amount of work done. The displacement of the object is 10 m to the right. a. 100 J b J c. 200 J d J 9. Use the diagram below to calculate the amount of work done. The displacement of the object is 10 m to the left. a. 100 J b J c. 200 J d J 10. Felix carries a 2 N suitcase up three flights of stairs (a total height of 10 m). Next, he uses a rope and pulley to lift the suitcase upward 7 more meters with a force of 2N. How much work does Felix do on his suitcase during this entire motion? a. 6 J b. 14 J c. 20 J d. 34 J 11. Pete fills drink orders for customers at a pizza restaurant. He fills a pitcher full of Cola, places it on the counter top and gives the 2.6- kg pitcher a 8 N forward push over a distance of 0.5 m to send it to a customer at the end of the counter. Calculate the work done by Pete on the pitcher during the 0.5 m push. a. 4 J b. - 4 J c J d J
4 12. Using the information from the previous problem, if the friction force by the counter top is 2 N, calculate the work done by the friction of the pitcher when it moves 0.5 m across the counter. a. 5.2 J b J c. 1 J d. - 1 J 13. What is the formula to calculate power? a. P =!! b. P = t W c. P =!! d. P = W t 14. When work increases, time stays the same, power. 15. When time increases, work stays the same, power. 16. What is the S.I. unit for power? a. Watt b. Meter c. Newton d. Joule 17. How much power does it take to do 10 J of work on an object in a time of 2 seconds? a. 5 J b. 20 J c. 5 W d. 20 W 18. How much power does it take to do 10 J of work on an object in a time of 0.5 seconds? a. 5 J b. 20 J c. 5 W d. 20 W
5 19. If a forklift is replaced with a new forklift that has three times the power, how much greater a load can it lift in the same amount of time? a. 0 b. One third times c. Three times d. Six times 20. Rick has a chore to move a rock with a force of 2 N a distance of 8 m. It takes him 4 seconds to complete the task. Calculate Rick s power. a. 1 W b. 4 W c. 16 W d. 32 W Device Time Interval Work Done Old Machine 10 seconds 60 Joules New Machine 10 seconds 80 Joules 21. The table above shows the power usage of an old machine and new machine. Compared with the Power used with the old machine, the power used with the new machine will: a. Increase b. Decrease c. Stay the same 22. Which of the following is not true about power? a. Power is a time- based quantity. b. Power refers to how fast work is done upon an object. c. Powerful people or powerful machines are simply people or machines which always do a lot of work. d. Power is work divided by time. 23. What is the formula to calculate efficiency? a. efficiency = work output / total work input b. efficiency = work output x total work input c. efficiency = total work input / work output d. efficiency = total work input x work input 24. When work output increases, total work input stays the same, the efficiency.
6 25. When total work input increases, work output stays the same, the efficiency. 26. What is the percent efficiency of a machine that requires 20 J of total work input to do 10 J of output work? a. 0.5% b. 2% c. 50% d. 100% 27. Two mechanical systems are evaluated for efficiency. Both systems require the same work input. If the work output of machine A exceeds the work output of machine B, select the statement that describes their efficiency. a. Machine A and machine B are equally efficient since their work input is the same. b. Machine A is more efficient than machine B since the work output is greater for machine B. c. Machine B is more efficient that machine A since their work outputs are different.
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