Physics Crossword #1

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Across
  1. 3. the bending of light around a corner
  2. 5. famous for the theory of relativity
  3. 6. the product of mass and velocity
  4. 7. give me a?
Down
  1. 1. the bending of light going into another medium
  2. 2. the study of how things move
  3. 3. the study of why things move
  4. 4. famous for three laws in classical physics