MOTION AND TIME

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Across
  1. 3. distance moved in unit time
  2. 5. the instrument used to measure speed
  3. 6. is the comparison of an unknown quantity with some fixed quantity of the same kind
  4. 8. what was used by the romans to measure time
Down
  1. 1. the instrument used to measure distance
  2. 2. a weight hung from a string
  3. 4. the time taken by a pendulum for one to and fro movement
  4. 7. a substance whose crystals can vibrate very fast , at a very precise rate