
Proper Frame
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A proper frame, or comoving frame, is a frame of reference that is attached to an object. The object in this frame is stationary, which is useful for many types of calculations. For example, a freely falling elevator is a proper frame for a free falling object in the elevator, while the surface of the Earth is not. Proper frames can be inertial as well as non-inertial as in the example above.