Rocket science crossword

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Across
  1. 2. of pressure: force
  2. 4. composed
  3. 6. force
  4. 7. Position
  5. 9. pressure
  6. 11. third law of motion: opposite reaction
  7. 12. push
  8. 13. Robert H. Goddard: engineer
Down
  1. 1. impulse: duration
  2. 3. tube-like
  3. 4. rising
  4. 5. chemical reaction
  5. 8. small rocket
  6. 10. von Braun: aerospace engineer