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In baseball, the rising fastball is a pitch perceived by batters, but known to be baseball-myth. Some batters claim to have seen a "rising" fastball, which starts as a normal fastball, but as it approaches the plate it rises several inches and gains a burst of speed.
Such a pitch is known to be physically impossible, due to restrictions of gravity, conservation of momentum, and air density. It has been explained as an illusion. What is really happening is that the pitcher first throws a fastball at one speed, and then, using an identical arm motion, is able to throw another fastball at a higher speed. The higher speed fastball both arrives faster, and sinks less due to its high speed. In fact, the added back-spin from the higher speed further decreases the amount of sink. Thus, as the pitch is thrown the batter expects a fastball at the same speed, yet it arrives more quickly and at a higher level. The batter's eyes and brain perceive it as a fastball which has risen and increased in speed. A switch from a two-seam to a four-seam fastball can further enhance this effect.
One might consider that this type of pitch does indeed rise--it does not rise higher above the ground after it has been thrown, but rather that it "rises" to a higher trajectory than a batter expects.
It is possible for a rising fastball to be thrown by a submarine pitcher because of the awkward technique with which they throw the ball. Because they throw almost underhand, with their knuckles near the dirt, it is possible for the ball to rise slightly as it gets to the plate. However, this is not the traditional rising fastball batters believe they see.
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