Santa's Physics crossword

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Across
  1. 6. How long a sled takes to reach the bottom.
  2. 8. Pull in a rope on a sled.
  3. 10. Friction keeping a sled stuck.
  4. 13. Straight-line change from North Pole to final stop.
  5. 15. Force pushing back on Santa’s sleigh.
  6. 19. Why a santa needs a seatbelt when someone break checks him
  7. 21. When a sled speeds up downhill.
Down
  1. 1. A push or pull, like starting a sled.
  2. 2. Sketch showing all forces.
  3. 3. How steep a snowy hill is.
  4. 4. Force slowing a sled on snow.
  5. 5. Speed and direction of Santa’s sleigh.
  6. 7. Total snowy path Santa travels.
  7. 9. Change in position, like a moving ornament.
  8. 11. How fast a sled moves.
  9. 12. Scientist famous for his 3 laws
  10. 14. How heavy the sack feels due to gravity.
  11. 16. Pull that makes snow fall.
  12. 17. An ornament dropping from a tree.
  13. 18. Friction on a moving sled.
  14. 20. How much stuff is in Santa’s sack.