1) A 7 N force is used to push a box 240 m.    How much work was done?    
 

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2) If 348J of work is done by a 24 N force pushing a box, how far did the box move?
 

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3) A student pushes his desk along the floor a distance of 25 m.  He pushes with a force of 250 N at an angle of 30 degrees with the floor.     How much work was done?
 

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4) A 45 kg box is dropped from the top of a building and hits the ground at 98 m/s.   How tall is the building?
               

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5) A motor does 25,000 J of work in 250 seconds.  What is the power produced?
 

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6) How long does it take a 60 watt motor to do 8500 J of work?    
 

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 7) What force is required to stop a 500 kg vehicle moving at 40 m/s over a distance of 100m?
 

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MULTIPLE CHOICE:

____ 1. The _________ is the unit for work.
____ 2. What is the value of the spring constant if 200 N of force is created when it’s compressed by 0.25m?
____ 3. __________ energy is the type stored in a compressed spring
____ 4. __________ is the rate at which work is done.
____ 5. What is the weight of a brick if it has 25,000 J of PE as it sits at the top of a 1000 m cliff?  
____ 6. To calculate work, the force and the distance moved must be in _________ direction.
____ 7. A 74 kg object moving at 3 m/s comes to a stop.  How much work was done to make it stop?
____ 8. __________ energy is associated with an object due to its position relative to the Earth.
____ 9. One joule of work accomplished in one second produces ___________.
____ 10. __________ energy is associated with an object in motion
____ 11. The conversion factor for mass changing into energy is ___________.