Machines Crossword Puzzle

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Across
  1. 2. w=?
  2. 4. is a device that makes work easier with only one movement
  3. 6. de/dr
  4. 7. f=?
  5. 10. d=?
Down
  1. 1. how many types of pulleys are there
  2. 3. a ramp is a type of
  3. 5. fr/fe
  4. 8. moveable and ... pulleys
  5. 9. first, second, and third class ...