Inventions and Technology Unit 3 Vocabulary Review

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Across
  1. 2. giant cross-bow
  2. 5. paddle at the back of a ship for steering
  3. 7. generates and detects sound waves
  4. 12. study of objects moving through the air
  5. 13. gun barrel with a spiraling groove
  6. 14. underwater vehicle
  7. 15. radar that uses change in frequency to determine the speed and direction that an object is moving
  8. 16. lever with the fulcrum between the effort and the weight
  9. 17. the upward force that a liquid or gas exerts on an object
  10. 20. lever with the effort between the weight and the fulcrum
  11. 21. SOund Navigation And Ranging; use of sound waves to detect objects
Down
  1. 1. wing-like attachment to the side of a submarine for stability and diving
  2. 2. material carried for the purpose of changing the weight of a vehicle
  3. 3. lever with the weight between the fulcrum and the effort
  4. 4. sends and receives sound waves in code for communication
  5. 6. RAdio Detection And Ranging; use of radio waves to detect objects
  6. 8. gun barrel that is smooth and polished inside
  7. 9. submarine designed to operate at deep level of the ocean
  8. 10. frequency of light and sound waves changes as the object moves toward or away from you
  9. 11. only detects sound waves
  10. 18. outside shell of a ship
  11. 19. propeller for moving a submarine