Solve the mystery

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Across
  1. 2. An idea of explanation that you then test through study and experiment
  2. 7. An increase in the rate or speed of something
  3. 8. The speed of something in a given direction
  4. 9. Consists of an abstract coordinate system and set of physical points in a coordinate system
  5. 10. The amount of space between two things
  6. 11. a quantity having direction as well as magnitude
  7. 12. A rate at which someone or something is able to operate
  8. 13. A system of ideas intended to explain something
Down
  1. 1. The displacement divide by time
  2. 3. A location relative to a reference point
  3. 4. A quantity having only magnitude not direction
  4. 5. This includes purpose, research, hypothesis, experiment, analysis and a conclusion
  5. 6. When the speed of an object changes at a constant rate
  6. 9. Any motion of a body where gravity is the only force acting upon it
  7. 12. Knowledge or study of the natural world based on facts through experimentation