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FORCE
Force is an influence that changes the state of rest or state of motion of a body.Force is a push or pull acting on objects and it has both magnitude and direction .

A force cannot be seen.  A force can be judged only by the effects which it can produce in various bodies (or objects) around us. A force can produce the following effects:
   1.    A force can move a stationary object.
   2.    A force can stop a moving body.
   3.    A force can change the speed of a moving body.
   4.    A force can change the direction of a moving body. 
   5.    A force can change the shape ( and size) of a body.


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