I have read answers on this site as well as the Wikipedia article, but they all add to the confusion. Some people suggest that a freely falling frame is an inertial frame. I learnt in classical mechanics that the frame attached to the surface of the earth is approximately inertial. Are there different definitions of it? The concept of inertial frames seemed easy and intuitive at first, but became complicated as I read more. So I am wondering wether you have to be well versed in general relativity to really understand this concept? If not, can anyone please explain the concept of the inertial frames, and how do we determine wether some real world frame is inertial?
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