What is another word for inertial frame?
Pronunciation: [ɪnˈɜːʃə͡l fɹˈe͡ɪm] (IPA) 
An inertial frame is a reference frame in which a body at rest remains at rest, and a body in motion continues to move in a straight line at a constant speed unless acted upon by an external force. Synonyms for the term "inertial frame" include "Newtonian frame," "non-accelerating frame," "unaccelerated frame," and "Galilean frame." Inertial frames play a crucial role in the laws of physics, especially in the principles of Newtonian mechanics. By using these frames, physicists are able to make accurate calculations and predictions of the movement and behavior of objects in the universe, from the smallest subatomic particles to the largest celestial bodies.
