Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In theoretical physics, an accelerated reference frame is usually a coordinate system or frame of reference, that undergoes a constant and continual change in velocity over time as judged from an inertial frame. An object in an accelerated frame will usually be compelled to move relative to the frame by a fictitious force. If this force is opposed mechanically, the transmission of this "holding force" through the object will make the object seem to feel accelerational "g-forces" as if it were suspended in a gravitational field, otherwise the force will be not directly detectable (not "felt") except by the motion it creates.

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