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