Friction and Gravity Crossword Puzzle

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Across
  1. 3. friction is this kind of force
  2. 4. type of friction produced when a dolphin swims in the ocean
  3. 6. of the sun, earth, and moon; the one that has the strongest gravity on you right now
  4. 9. "air _____"; another name for fluid friction in the atmosphere
  5. 11. type of friction produced between wheels and the ground
  6. 12. how far away two objects are from each other
  7. 13. type of friction produced between pencil and paper
  8. 14. the amount of matter in an object
Down
  1. 1. scientist who theorized that objects bend space
  2. 2. force of gravity pulling objects toward the Earth gives objects this
  3. 5. as the distance between objects increases, the strength of gravity between them
  4. 7. force produced by objects because of their masses
  5. 8. force produced when two surfaces rub against each other
  6. 10. type of friction preventing an object from sliding