Crossword

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Across
  1. 1. How high or low a sound is
  2. 6. Unit used to measure work or energy
  3. 9. Energy you can hear
  4. 11. Type of wave that needs a medium
  5. 13. Simple machine that changes direction of force
  6. 14. Waves canceling each other
  7. 18. Force opposing motion through air
  8. 20. How long motion takes
  9. 21. Tool used to measure mass
  10. 22. A push or a pull
  11. 24. Form of energy that allows sight
  12. 26. Force pulling objects toward Earth
  13. 31. Amount of matter in an object
  14. 32. Simple machine with a fulcrum
  15. 36. Change in velocity
  16. 38. Object that separates light
  17. 40. Maximum falling speed
  18. 41. A repeating movement that transfers energy
  19. 42. Distance traveled per time
  20. 45. Bouncing of light
  21. 47. Speed with direction
  22. 48. Energy of motion
  23. 49. Direction friction acts against motion
Down
  1. 2. Slanted surface
  2. 3. Location of an object
  3. 4. Force applied over a distance
  4. 5. Bending of light
  5. 7. Parts of visible light
  6. 8. Number of waves per second
  7. 10. Mass per volume
  8. 12. Volume of sound
  9. 13. Stored energy
  10. 15. Way something moves
  11. 16. Simple machine that splits objects
  12. 17. Resistance to change in motion
  13. 19. Ability to do work
  14. 23. Part of the eye that detects light
  15. 25. Overlapping of waves
  16. 27. Simple machine that helps lift objects
  17. 28. Waves combining to make a larger wave
  18. 29. SI unit of distance
  19. 30. How well a machine works
  20. 33. Place with no matter
  21. 34. How far an object moves
  22. 35. Force that slows motion
  23. 37. Height of a wave
  24. 39. Rate of doing work
  25. 43. Flat surface of an inclined machine
  26. 44. Change in position over time
  27. 46. Tool that makes work easier