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Across 3. your favorite forty minutes 5. measures mass 12. putting theory to the test 15. without this, it's just a number 18. for friction, it's mu 19. sticking collision 20. from here to there 22. change in momentum 24. you can't move it if you can't do better than this (2 words) 26. measure of inertia 28. 1/86400 of a day 30. carts move apart 32. one forty-millionth the distance around the equator 34. tends to stay put 35. could rub you the wrong way 36. big name in force 37. how fast and which way 38. how fast 39. perpendicular force 40. progess

Down 1. force to keep it moving (2 words) 2. rise over run - could be slippery 4. the path of a projectile 6. seeking to be centered 7. vector sum 8. bouncing collision 9. an object flying freely 10. how much - not which way 11. force of earth on a mass 13. Italian experimenter 14. delta vee / delta tee 16. measures weight 17. the REAL Mr. Fizix 21. mass, time, speed, etc. 23. push me - pull you 25. it lies on an axis 27. diagram to show the forces (2 words) 29. length of the path taken 31. gives a value direction 33. mass of a liter of water at STP