who's that teacher

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Across
  1. 3. f=ma
  2. 5. electrons
  3. 7. 9.8m/s^2
  4. 8. ____ is always conserved
Down
  1. 1. ___ world
  2. 2. catapult
  3. 4. smallest thing in the universe
  4. 6. space is a ______