Physics Crossword Puzzle

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Across
  1. 2. The capacity to do work
  2. 7. Opposition to movement
  3. 9. Particle of light
  4. 11. Weight of 1.4kg. The most complex object in the solar system
  5. 12. Physicist known for the theory of relativity
Down
  1. 1. Number of cycles per second
  2. 3. Ut tensio, sic vis
  3. 4. If I have seen further it is by standing on the shoulders of giants
  4. 5. Force applied over a distance
  5. 6. Mass in motion
  6. 8. Discovered Polonium
  7. 9. Rate at which work is done
  8. 10. Amount of matter in an object