inertial reference frames

An inertial reference frame is a viewpoint or perspective in which an observer measures movements without experiencing any acceleration. In such a frame, objects either remain still or move at constant speed in a straight line unless acted upon by a force. For example, if you are riding in a smoothly moving train, you could consider yourself in an inertial frame, as you would not feel any push or pull. This concept is crucial in physics because the laws of motion apply consistently within these frames, allowing for accurate predictions of how objects behave.