Puzzle time

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Across
  1. 2. the ability to cause change
  2. 4. how heavy something is
  3. 5. a measure of the amount of matter in an object
  4. 7. the force of attraction between objects due to their mass
  5. 9. an objects change in position
  6. 10. the push or pull effect
Down
  1. 1. the rate at which velocity changes over time
  2. 3. the amount of space between two objects
  3. 6. when only the force of gravity is acting on and object
  4. 8. an object travels around another object