Wikipedia says a force is any interaction that, when unopposed, will change the motion of an object. But in a site i find this , force is a "quantitative" description of an interaction that causes a change in an object's motion.Which is the better definition?
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The two definitions are equivalent if the motion is seen by an inertial observer. But, with respect to an observer motionless on the Earth surface, "something changing the motion of an object" will include the centrifugal and Coriolis forces, and one would be hard-pressed to call those "interactions", as that would not be in the same sense as gravitational or electrostatic interactions e.g.
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I think that wikipidea's definition is better because accroding to the second definition force changes the state of motion of the object which is not necessarily true becuase sometimes the force is not strong enough to change the state of motion of an object. According to me the simplest definition of force would be :- A push or a pull which tries to change the state of motion of an object is called force.
