is inertia of direction and centrifugal force the same?

Answer 1

Hi 08285 2., (again!)

Inertia is a property. It describes the tendency of a mass to keep moving at its original speed and direction.

I might digress to point out that sometimes we use language to denote an "intensive" property and sometimes an "extensive" one. Inertia is "intensive".

The measurable thing associated is momentum. It has magnitude and direction (and don't forget the units!)

There is no "inertia of direction" therefore.

And there is no centrifugal force. Centripetal force is the force you may exert to keep an object moving in a circular path at constant speed. Just because you are exerting a force doesn't mean there is an opposing force! The force you do exert changes the direction of the object's motion. That is all.