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Energy, Work, Power 8. Define Work and Power 9. How much work is done by pushing a box with a force of 25N Across a floor for 5m? 10. How much work is done by pulling a desk with 15N of force of 3m? If it took you 10 seconds to move the desk, how much power did you exert? 1 1. Define... Kinetic Energy and Potential Energy 12. Explain the changes in Kinetic Energy and Potential Energy as a pendulum swings back and forth. b. Draw a pendulum just before release and at the bottom of its swing Momentum 13. If a truck and a Smart Car traveling at equal speeds have a head-on collision, which vehicle will experience the greatest: . force of impact? b. change in momentum? c. acceleration? 14. A ball of mass 3.0 kg, moving at 2 m/s eastward, strikes head-on a ball of mass 1.0 kg that is moving at 2 m/s westward. The balls stick together after the impact. What are the magnitude and direction of the velocity of the combined mass after the collision? 15. Discuss the following in terms of impulse and momentum: a. Why are padded dashboards safer in automobiles? How do airbags work? b. Why are nylon ropes, which stretch considerably under stress, favored by mountain climbers