Class 7 Physics Motion and Time Speed


Speed is the rate of change of position of an object with time.The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the intervalHence,

Unit of Distance is meter or Kilometer and that of time is second or hour. Common units of speed are therefore metre/second or m/s or Kilometer/Hour or km/h.Units are always written in singular, that is, km/h and not kms/hrs.



Fast and Slow Motion/Speed:Speed can be fast or slow depending upon the distance covered by them in a given interval of time. Since a motorbike covers more distance in a given interval of time than a bicycle, the bicycle is said to be in slower motion and motorbike in faster motion.

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