science words

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Across
  1. 2. distance between two objects changing
  2. 7. ability to gain speed
  3. 8. apply or bring to bear
Down
  1. 1. 2 or more objects resulting in a change of motion
  2. 3. speed of an object in a specified direction
  3. 4. distance traveled in a certain amount of time
  4. 5. a body of matter
  5. 6. a push or pull on an object