May the for be with you

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Across
  1. 2. when you pull a spring
  2. 4. contact force when 2 objects move against each other
  3. 5. used to reduce the friction
  4. 7. (2 words no space) useful for parachute
  5. 9. the unit to measure forces
  6. 10. region where certain objects experience a non-contact force
  7. 12. will reduce the drag forces on it if the object is ...
  8. 13. (2 words no space)a support force balances the weight of an object
  9. 17. (2 words no space) a region where a mass would experience a non contact-force
  10. 20. equipment to measure forces
  11. 21. the force that makes a spring return to its original length
Down
  1. 1. (2 words no space) a solid that moves through a gas or liquid
  2. 3. the balanced forces cancel out
  3. 6. type of relationship between force and extension
  4. 8. is what we call the amount an object is stretched by
  5. 11. 2 equal forces acting on the same object in opposite direction
  6. 14. (2 word no space) occurs when objects are touching
  7. 15. can be push or pull
  8. 16. if the object is not in equilibrium forced are ...
  9. 18. an example of reaction force
  10. 19. is mass multiply by gravitational field strength