Mathias Physics Puzzle

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Across
  1. 8. Sound is a type of _____ wave
  2. 9. Light is a type of _____ wave
  3. 11. ___ is the metal in the centre of the star that causes the death of a star (evil)
  4. 12. If we continue to shoot Carbon dioxide in the ____, we will all die :(
  5. 14. Unlike popular belief,___ is actually the third primary colour (Red, blue and ___)
  6. 15. The ___ law of newton states that for every action (force) in nature there is an equal and opposite reaction
  7. 17. The _________ is approximately 300,000,000 m/s if it is in a vacuum
  8. 18. The highest point in a wave is the ___
  9. 21. If a star is big enough, it becomes a __
Down
  1. 1. ____ is the force that brings you back down when you jump up
  2. 2. Mathias has ______ (a lot of funds)
  3. 3. The creator of this puzzle, (____) is literally Albert Einstein
  4. 4. This was a ______ crossword!
  5. 5. If you don't cooperate, physics will use brute ___
  6. 6. Unlike weight, ___ isn't affected by gravity
  7. 7. The ____ law of newton states that an object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force
  8. 10. _____ is affected by gravity (Starts with a W)
  9. 12. change in velocity / time taken
  10. 13. The ___ ray is the one that first hits the mirror
  11. 16. The lowest point of the wave is the ____
  12. 19. The sun is a ______ dwarf
  13. 20. The ___ ray comes after the Incident ray bounces off of the mirror