Forces and motion so far

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Across
  1. 3. when an object slows down
  2. 6. the force used by brakes to slow a car down
  3. 7. _________ of mass is the point where an object's weight appears to act from
  4. 8. Measures how quickly something speeds up
  5. 10. The direction opposite to South
  6. 12. The force of gravity on an object
  7. 13. speed is the gradient or how ______ the line on a distance time graph is
  8. 14. Speed with a direction
Down
  1. 1. When more than one force is combined by adding or subtracting
  2. 2. A word used to describe motion which is not changing
  3. 4. Air resistance is an example of a _______ force
  4. 5. speed x time =
  5. 9. Always plotted as the x axis of a motion graph
  6. 11. acceleration = ______ in velocity / time taken
  7. 13. Measured in m/s