On a tangent from the article since this isn't a forgotten meaning of jerk but i've always been surprised at how often the 3rd derivative of position crops up usefully in life.

Just as interesting to me is the fact I've never (i don't think) had a practical use for the 4th derivative, jounce (think this is a British English term, American is snap i believe). The only place i've seen it used is in car suspension design.

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sokoloff 5 days ago | parent [-]

In American Mech E, the 4th through 6th derivatives of position are snap, crackle, and pop.

Since graduating over 30 years ago, I’ve only ever used or cited crackle and pop on internet message boards or as trivia, never in actual engineering.

	▲	throwup238 5 days ago \| parent [-]
		IME crackle and pop are used in space raft design to minimize structural stresses and fuel consumption during orbital maneuvers, precision CNC manufacturing to reduce vibration and improve tolerances, robots like pick and places to minimize wear and tear, semiconductor fabs for their precision positioning systems, and cam design for engines.