Science Forces & Work / Simple Machines

Question or Hint Answer or Word
  1. to be considered work, you need a ____ ____ through which a force acts force and distance
  2. formula for work work=force X distance
  3. what is the unit for work joules
  4. a machine is any device that makes doing work easier
  5. two basic types of SM of which all other SM are variations of inclined planes and levers
  6. what do most SM do make work easier by reducing the force needed
  7. do SM make less work? no, SM make work easier they do not decrease the amount of work
  8. SM can actually make more work due to friction
  9. "machines make work easier" force vs. distance SM make work easier to do by decreasing the force required by increasing the distance over which the work is done
  10. a force applied by a machine to an object is the resistance force
  11. a force applied to a machine by a person is the effort force
  12. what are the exceptions to SM make work easier and an advantage of each machine single fixed pulley- changes the direction of a force; 3rd class lever-gives us increased speed
  13. Is work done when someone is sitting on a cushion on the floor no work
  14. a baseball is hit into the bleachers work is done
  15. Mary holds a doorstop in one place to show you an example of a wedge no work
  16. a little girl is pushed on a swing work is done
  17. examples of inclined planes wedge and screw
  18. examples of levers pulley and wheel and axle
  19. an inclined plane decreases the ____ needed to lift an object by ____ the distance that force is applied force; increasing
  20. less force= more distance
  21. more force = less distance
  22. inclined planes can increase the amount of work done due to friction
  23. if the force required to lift a barrel into the back of a truck was 124 Newtonss without a SM, what would the force required to get the barrel into the back of the truck using a ramp less than 124 Newtons
  24. if it takes 45343 joules of work to lift a barrel into the back of a truck without using a SM, how much work would be required to get the barrel into the back of the truck using a ramp more than 45343 Joules

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