simple machine

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Across
  1. 4. tree
  2. 7. be used to split things
  3. 8. a sloped flat surface
  4. 10. is
  5. 11. called
  6. 13. actually a wheel and axle
  7. 15. move
Down
  1. 1. Object
  2. 2. 15 seconds
  3. 3. attached to the centre
  4. 5. Machine
  5. 6. ways
  6. 7. wedge
  7. 9. is
  8. 12. strength
  9. 14. lift
  10. 16. my