Before revision: In mountain biking and skiing, the line of greatest slope is sometimes called the fall URL Farlow Gap - Mountain Biking: fall line (2nd paragraph) — "The trail becomes loose and rocky, and becomes fall line into a wide open rock garden..." Definition Mathematically, the line (or path) of greatest slope from a point is determined by the gradient of height, taken as a potential field with respect to an acceleration from the force of gravity.
After revision: In mountain biking and skiing, the line of greatest slope is sometimes called the fall URL Farlow Gap – Mountain Biking: fall line (2nd paragraph) — "The trail becomes loose and rocky, and becomes fall line into a wide open rock garden..." Definition Mathematically, the line (or path) of greatest slope from a point is determined by the gradient of height, taken as a potential field with respect to an acceleration from the force of gravity.