Physics of Martial Arts

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Across
  1. 3. the addition or subtraction of multiple forces
  2. 4. a Japanese martial art which also means 'empty hand'
  3. 6. the unit for force
  4. 8. the amount of space something takes up
  5. 10. a measure of how much matter something contains
  6. 14. a martial art that involves lots of kicking
  7. 16. a measure of something's speed
  8. 17. when an object speeds up
  9. 18. the downwards force due to gravity
Down
  1. 1. when an object slows down
  2. 2. the amount of space between two objects or places
  3. 5. related to mass and resists changes of motion
  4. 7. when forces are balanced the speed is " "
  5. 9. a Māori martial art involving the taiaha, the patu, the koikoi, and other traditional weapons
  6. 11. another word for at rest / not moving
  7. 12. changes an objects speed, direction, or shape
  8. 13. a martial art that only allows punching
  9. 15. a chinese martial art made world famous by stars like Bruce Lee and Jackie Chan