physics puzzle

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Across
  1. 3. stone used in modern clocks
  2. 6. uses sun to measure time
  3. 7. comparison of a unknown quantity with a known quantity
  4. 8. the movement of a object
  5. 9. used in grandfather clocks, the part which goes to and fro
Down
  1. 1. used to measure time in ancient times with sand
  2. 2. used to in our cars to find the speed of it
  3. 4. the largest unit of time
  4. 5. ___ of a object can be found with distance/time
  5. 6. the modern way of measuring small lengths