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