I want to know clearly the real concept of inertia.I have seen lot of definitions regarding inertia.But I could not exactly find real meaning of inertia.
what is actually inertia?
Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force (Oxford physics definition). It is the basis of Newton's first law of motion.
The amount of inertia that an object possesses is proportional to its mass. So anything that has mass has inertia.
what happens if such property is not possessed by matter..ie, if there is no inertia?
For one thing, it would mean you could accelerate an object without the application of an external force, in violation of Newtons first law. To the best of my knowledge such a phenomenon has never been observed.
Hope this helps.