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In page Jerk (physics):
"Further time derivatives have also been named, as snap or jounce (fourth derivative), crackle (fifth derivative), and pop (sixth derivative).[1][2] The seventh derivative is known as "Lock", as it is a logical continuation to the cycle. The eighth derivative has been referred to as "Drop".[citation needed] Even though, the seventh and eighth derivative are not officially recognized and thus no reliable source is found. Time derivatives of position of higher order than four appear rarely.[3]
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