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