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Across
  1. 3. fall object falling where only force acting on it is that of gravity
  2. 5. a set of connecting things or parts where it makes a whole
  3. 6. the speed of something in a given direction
  4. 9. a tendency to do nothing or remain unchanged
  5. 11. the great size or extent of something
  6. 12. where opposing forces are equal
  7. 14. increase in the rate or speed of something
  8. 15. push or a pull
Down
  1. 1. a coherent typically large body with no definite shape
  2. 2. a body's relative mass or the quantity of matter contained by it
  3. 4. approximate age
  4. 7. how fast something is traveling
  5. 8. history on how the solar system formed
  6. 10. exact age of an object
  7. 13. having only magnitude not direction