See Inertial frame of reference for more discussion on this.

To explore that question, begin in an inertial frame of reference.

It can be considered equivalent to them but in a different inertial frame of reference.

In other words, there are no privileged inertial frames of reference.

This means that the particles were in inertial frames of reference.

It is important to note some assumptions made above about the various inertial frames of reference.

The total work done is independent of the inertial frame of reference.

Therefore, by transforming from an inertial frame of reference to another, we will be able to get the desired results.

Inertia has no meaning without an inertial frame of reference: which must be the entire universe.

In an inertial frame of reference attached to the road, there is no physical force moving the rider backward.

Replies: Centrifugal force does not exist in an inertial frame of reference.

In addition to events and physical objects, there are a class of inertial frames of reference.

Because the distance covered while applying a force to an object depends on the inertial frame of reference, so does the work done.

For example, the special theory of relativity assumes an inertial frame of reference.

The explicit concept of an inertial frame of reference was not developed until long after Newton's death.

OR: The laws of physics are the same in all inertial frames of reference.

An inertial frame of reference is defined as one in which all laws of physics take on their simplest form.

This postulate defines an inertial frame of reference.

The concept of inertial frames of reference is no longer tied to either the fixed stars or to absolute space.

The surface of the Earth is rotating, so it is not an inertial frame of reference.

Because of these extra terms, the "coordinate" fictitious force is not zero even in an inertial frame of reference.

(It is no accident that in an inertial frame of reference this becomes the familiar velocity time dilation ).

As expected, for a non-rotating inertial frame of reference the centrifugal force and all other fictitious forces disappear.

A frame moving uniformly with respect to such a frame is also an inertial frame of reference.

These names are used in a technical sense, to mean simply that these forces vanish in an inertial frame of reference.