Physics crossword puzzle

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Across
  1. 3. has magnitude and direction
  2. 6. the negative change in velocity
  3. 7. y axis
  4. 8. Isaac ...
  5. 9. it's a constant and the matter in a particle or object
  6. 14. a push or a pull that acts on an object due to the interaction with another object
  7. 15. what you use to find the distance travelled by an object in the speed-time graph
  8. 16. distance it travels per unit time
  9. 18. the tendency of a body to resist a change in motion or rest
  10. 20. the positive rate of change in velocity
  11. 21. it's a vector quantity and includes direction
Down
  1. 1. Distance or quantity
  2. 2. speed remains the same (constant speed)
  3. 4. g = 9.8
  4. 5. m, cm, km
  5. 10. what represents the magnitude of the acceleration of a line
  6. 11. total distance, average speed, time taken
  7. 12. has a magnitude but no direction
  8. 13. x axis
  9. 17. moving from a to b but with a direction
  10. 19. it's a gravitational force on an object with mass