Rocket Science

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Across
  1. 3. Not smooth
  2. 6. A force that propels something
  3. 11. f=ma
  4. 13. Robert_H._Goddard A famous American rocket scientist
  5. 15. Equal and opposite
  6. 16. Speed in a certain direction
  7. 17. The average location of weight on an object
Down
  1. 1. inertia
  2. 2. Objects that propel an object
  3. 4. Smooth
  4. 5. A force that resists movement
  5. 7. A substance used to push an object in a given direction
  6. 8. An object propelled by contained propellant
  7. 9. Thrust times duration
  8. 10. takeoff
  9. 12. A famous German rocket scientist
  10. 14. The point where all of the pressure is focused on an object.