If one goes deep into the relativistic movements of energy, then one will easily realize that there is only motion. When there is a danger to the existence of one form of motion, it will change its behaviour by giving birth to another form of motion.

 

The constant character of the object is an incorrect statement because everything in this universe is in active motion. Even when there is no visible external motion, there will be invisible internal motion.  There is no state of constant velocity or state of rest for any given object. The motion of every object depends on the particular space-time where the particular energy acts as an external force.

 

The object can remain constant to our naked eye only when the forces from all sides of the object balance one another. If the forces are not in balance then the object cannot remain constant to our naked eye.

 

In other words, the internal resisting power of a particular object will maintain its visible stillness till the external force interferes and generates an adverse pressure. If there is no external interference then naturally the internal motion of the particular object will reach the exciting state. However, one cannot conclude all these internal and external movements of the object as INERTIA or THE INERTIAL MASS OF THE BODY.

 

Further, whenever the external force resists the internal movement of any given object, the internal resisting power of the particular object behaves as a force and generates contra repulsive energy to maintain the overall balance of the object.

 

In atmosphere, the speed of every object is connected with the speed of the external force or pressure applied.