Force is the physical quantity with which an object can be pushed or pulled.
Principle of force is defined in terms of the principle of equivalence i.e. gravitational mass = inertial mass.
Force is used to change the state of the body. 
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Force is any pish or pull applied on an object which brings or tries to bring about a change in the motion, direction of motion, or state of rest of an object. Dont get it what were you trying to say by its principles.
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