Motion and time

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Across
  1. 3. the number of oscillations per second
  2. 6. gives the distance travelled in km
  3. 7. the movement of the bob from one position and returns back to the same position is known as 1 ________
  4. 10. anything that occurs or appears at regular intervals can help us to measure __________
Down
  1. 1. a crystal substance .this substance vibrates very fast at a precise rate
  2. 2. is the comparison of an unknown quantity with some fixed quantity of the same kind
  3. 4. which scientist discovered the simple pendulum
  4. 5. the standard unit of temperature is ______
  5. 8. the distance covered by a moving object in unit time
  6. 9. is the most accurate clock .the vibrations are regular