how is the definition of force obtained from Newton's first law of motion
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According to mewton's first law of motion an object which is at rest will stay at rest or an object in motion will stay in motion until or unless any external force is applied. If there is no frictional force or air existence then the things move for ever and ever
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Newton's first law of motion doesn't define force. It defines inertia - the tendency of matter to resist changes in motion (change of speed or direction). The more matter (mass) something has, the more it resists changes in its motion. We call this resistance "inertia."
A force is something that will change an object's motion (speed or direction) if it is not balanced by another force. Put another way, a force that's not balanced causes an acceleration (a change in motion). Forces are measured in Newtons or in pounds, and have a direction, so we say a force is a vector (a quantity that has a magnitude and direction).
I hope it helps :)
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