# Parabolas in Nature?

Though they are more commonly discussed in mathematics, parabolas are also seen in the natural world. Without any outside help, some natural occurrences simply take on the symmetry of a parabola all on their own. For instance, when a ball is thrown in the air, its natural path up and back down again, which is controlled by the pull of gravity, is considered parabolic. This same shape is seen when dolphins crest through the waves and back down again, and also in the path of a water spout.
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 A parabola is the set of all points that are equidistant from a point and a http://www.chacha.com/question/what-is-a-classic-p...
 A tree branch bending under the weight of snow :D. http://answers.yahoo.com/question/index?qid=201203...
 Parabolic curves and surfaces (paraboloids) occur in nature and by human activity in approximation. Due to external factors such as air friction, wind, and earth's rotation however, http://ph.answers.yahoo.com/question/index?qid=200...
 dy/dx = 0 at a turning point. dy/dx = -2 - 2*x. = 0 if x = -1. Turning point at x = -1 < d2y/dx2 = -2.negative, hence turning point is a maximum. Thus the curve is an upside-down http://answers.yahoo.com/question/index?qid=201309...
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