Use the force

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Across
  1. 3. Explained with a messy room
  2. 4. Has magnitude and direction
  3. 8. Simple definitions ignore surface area*
  4. 14. Defined by Coulumb's law*
  5. 15. Weakest of the fundamental forces*
  6. 18. Maximum value of a wave
  7. 19. Rotational equivalent of linear force*
  8. 20. Coriolis force, for one*
  9. 21. Preceded by the galvanometer
Down
  1. 1. Newtonian telescopes, for one
  2. 2. Defined by Hooke's law*
  3. 5. Voltage
  4. 6. They use lenses instead of mirrors
  5. 7. Causes redshift and blusehift
  6. 9. Defined by newton's first law
  7. 10. Pluto had too much of it
  8. 11. Can be described with a single value
  9. 12. Archimedes has a famous one
  10. 13. Conserved when energy is not
  11. 16. These images are upright
  12. 17. He has a law and a constant
  13. 19. One Coulumb per meter per second