Science HWK week 2

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Across
  1. 2. a word meaning impact
  2. 3. running lengthwise rather than across
  3. 5. a word meaning mass
  4. 7. gaining speed
  5. 9. a space entirely devoid of matter
  6. 10. the SI unit of force
  7. 13. force responsible for gravity
  8. 16. a word starting with i meaning laziness
  9. 17. air particles spread out
  10. 18. the rate per second of a vibration constituting a wave
  11. 19. a course along which someone or something moves
Down
  1. 1. speed of something in a given direction
  2. 4. reduce speed
  3. 6. relating to the interrelation of electric currents or fields
  4. 8. air particles pushed together
  5. 11. size of one oscillation
  6. 12. causes the red shift seen by astronomers
  7. 14. the maximum extent of a vibration
  8. 15. the rate at which something or someone moves