Work&Energy Review

# Work&Energy Review - Work Energy Review Questions 1 Is...

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1. Is it possible to do work on an object that remains at rest? 1)Yes 2) No 2. A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction? 1) friction does no work at all 2) friction does negative work 3) friction does positive work 3. In a baseball game, the catcher stops a 90-mph pitch. What can you say about the work done by the catcher on the ball? 1) catcher has done positive work 2) catcher has done negative work 3) catcher has done zero work 4. A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension? 1) tension does no work at all 2) tension does negative work 3) tension does positive work 5. A box is being pulled up a rough incline by a rope connected to a pulley. How many forces are doing work on the box? 1) one force 2) two forces 3) three forces 4) four forces 5) no forces are doing work 6. You lift a book with your hand in such a way that it moves up at constant speed. While it is moving, what is the total work done on the book? 1) mg × r 2) F HAND × r 3) (F HAND + mg) × r 4) zero 5) none of the above 7. By what factor does the kinetic energy of a car change when its speed is tripled? 1)

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Work&Energy Review - Work Energy Review Questions 1 Is...

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