Science terms

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Across
  1. 4. the length of two things apart
  2. 6. when gravity is pullingit down and no other forces are acting on it
  3. 7. travels around another object in space
  4. 8. a push or pull
Down
  1. 1. the amount of matter
  2. 2. a force of attraction between objects that is due
  3. 3. the combination of all the forces acting on an object
  4. 4. a friction like force that opposes the motion of an object
  5. 5. the tendancy of all objects to resist change in motion