This is inertia of direction. It is the ability of body to be in a state of direction of motion, for examplesun holds planets in a fixed elliptical path this is one of the examples of inertia of direction. Inertia ofdirection is non-existent, however inertia only apply to a body at rest or moving with a constantvelocity. It is the property possessed by a body to resist change. In other way we can say that if a bodymoves in a particular direction under the action of a force and if the force is removed then they willcontinue to move in the same direction unless stopped under the action of another opposing force fora body at rest and under the inertia of rest whereas inertia of motion is for bodies in motion.