the forces of the earth

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Across
  1. 2. moves things toward it
  2. 3. pulls masses together
  3. 4. another use of friction
  4. 5. moves things away from it
  5. 8. holds particles together
  6. 9. related to all of the above
  7. 11. forces create this
Down
  1. 1. was come up with by Isaac Newton
  2. 2. how matter and force interact
  3. 6. came up with principia
  4. 7. most forces result in this
  5. 10. another use of traction