puzzle time!

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Across
  1. 2. a dimensionless quantity representing the amount of matter in a particle or object
  2. 4. a point of time as measured in hours and minutes past midnight or noon.
  3. 6. move under the force of gravity only; fall rapidly.
  4. 8. the resistance that one surface or object encounters when moving over another.
  5. 9. speed of motion, action, or operation; rapidity; swiftness
  6. 10. the rate of change of velocity.
Down
  1. 1. the moving of something from its place or position
  2. 3. the curved trajectory of an object such as the trajectory of a planet around
  3. 5. the universal force of attraction acting between all matter.
  4. 7. the magnitude or size of displacement between two positions