Mechanical Crossword

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Across
  1. 3. a tight string has it
  2. 6. it opposes motion
  3. 7. not the same as weight
  4. 9. one part of
  5. 10. vector from point A to point B
  6. 12. change in y over change in x
  7. 17. towards the centre
  8. 18. it pulls downwards
  9. 19. about movement
  10. 20. not horizontal
Down
  1. 1. it's less on the Moon
  2. 2. mass times velocity
  3. 4. it causes acceleration
  4. 5. it has a parabolic path
  5. 8. rate of change of velocity
  6. 11. it's a vector
  7. 13. useful output compared with total input
  8. 14. available but not being used
  9. 15. has no direction
  10. 16. rate at which work is done