Question

Centripetal force is present in both inertial and non inertial frame of reference then how centrifugal force is only present in non inertial frame of reference, it simply means that it is absent in inertial frame of reference , is it true?

Answer 1

The centrifugal force is an inertial force: a force that has to be included in Newton’s laws if you want to apply them in a non-inertial frame of reference (in this case, a rotating frame of reference). If you are in an inertial frame, you never need to introduce the concept of a centrifugal force. For example, when a car turns to the left and you are thrown to the right, relative to an inertial frame, you move straight, which results in the separation between the side of the car and you to decrease: not because you have moved to the right but because the car moves to the left.

The centrifugal force is an inertial force that exists only in a rotating (and therefore non-inertial) frame of reference.

If you work in an inertial reference frame, which will be the case unless you know otherwise, there is no centrifugal force, at all, ever.