puzzle time

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Across
  1. 3. a force that pulls objects and people down to earth.
  2. 5. As mass increases gravitational force increases
  3. 6. no other force acting on something except gravity
  4. 8. Si units
Down
  1. 1. newtons 1st law
  2. 2. pulls stuff slowly down to earth
  3. 4. never changes, always the same
  4. 7. Always changing never the same