^External force

^External force

  1. Any force acting outside the system selected is called external force.
  2. Only external force can accelerate a system.
  3. Force internal or external is a matter of selection of system. e.g. if we consider a system of earth & sun, then the gravitational force on earth by sun & that by sun on earth are internal, but if we consider the system earth only then the same gravitational force on earth becomes external force & accelerates earth around the sun.

 

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