The wheel and axel, gears and pulleys

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Across
  1. 3. teeth
  2. 4. small cylinder and a crank
  3. 5. mechanical advantage of a single movable pulley
  4. 7. smaller gear VS larger gear
  5. 8. attached to something
  6. 9. mechanical advantage of a single fixed pulley
  7. 12. follower gears and driving gears
  8. 14. curtains
Down
  1. 1. another word for gear
  2. 2. pulley system made up of many pulleys
  3. 6. the second gear
  4. 7. wheel and axle
  5. 10. allows gears to turn in same direction
  6. 11. attached to motor or handle
  7. 13. half of the diameter