It is either a push or a pull exerted by one object on another.(E.g.Gravitational force, Frictional force ,Magnetic force, Elastic force, Squeezing force, Stretching force , Folding force ,Twisting force.)
S.I. Unit For force is Newton(N)
Extension/Compression Spring balance can be used to measure force.
Force can ...
-Move a stationery object
-Change the speed of a moving object
-Change the shape and size of an object
-Change the direction of an object
-Stop a moving object
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