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Across 1. your teacher's name 5. image behind a mirror 6. F= , the most famous equation in physics 7. bending of light 9. you are never upside-down in these mirrors 11. used to make easy conversions 12. change of velocity over time 14. Joule showed that total energy is always a 15. a timing device 16. they have 2 focal points 19. mass times velocity 20. force times displacement

Down 2. significant digits have to do with 3. Earth's acceleration 4. your favourite class 6. unit of length 8. meeting place for rays coming from infinity 10. unit of force 13. use conservation of momentum to solve these 17. force times time 18. change of energy over time