Forces, yay

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Across
  1. 3. opposite of unbalanced
  2. 7. measuring forces
  3. 9. very secret
  4. 11. the other end of your phone call is your ....
  5. 12. something that zaps you
  6. 13. in space there is no .....
  7. 14. pull and .....
Down
  1. 1. what is this crossword about?
  2. 2. creator of the thing that this crossword Is about.
  3. 4. without this, we would just flop everywhere!
  4. 5. opposite of balanced
  5. 6. a force that can repell and attract at the same
  6. 8. lightning.
  7. 10. units of force
  8. 14. push and ......