motion and time

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Across
  1. 1. distance moved in unit time
  2. 4. the standard unit of temperature
  3. 5. this system is used uni-formally all over the world
  4. 7. the periodic movement of a pendulum is called
  5. 8. crystals used in electronic wristwatches
Down
  1. 2. clocks that measures time accurately could be made only after discovery of this instrument
  2. 3. quantities like length,weight,time and speed etc are called _______ quantities
  3. 4. the standard unit of mass
  4. 6. the type of motion if a body travels in a straight line and covers equal distance in equal intervals of time