Sir Isaac Newton Crossword

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Across
  1. 2. The force of gravity pulling down on an object.
  2. 3. The amount of 'matter' in an object.
  3. 6. The scientific equipment used to measure force.
  4. 7. Equivalent to 100g.
Down
  1. 1. Important person in Scientific history.
  2. 4. The amount of stuff in an object.
  3. 5. Sir Isaac Newton discovered the force of _______.