simple machines vocabulary

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Across
  1. 3. ratio of output force to input force
  2. 5. substance that reduces friction
  3. 8. parts that work together to perform tasks
  4. 10. considering side effects of a system
  5. 13. task the system performs
  6. 14. not wanted outputs of a system
  7. 15. people or animals that work together
  8. 16. resisting movement of objects
Down
  1. 1. push or pull
  2. 2. physical parts that work together
  3. 4. the quantity of force
  4. 6. force energy & raw materials in a system
  5. 7. ability to apply force to move an object a distance
  6. 9. result when force moves an object
  7. 10. a device
  8. 11. the unit to measure force
  9. 12. formula to calculate work