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#REDIRECT [[Fourth, fifth, and sixth derivatives of position#Sixth derivative]] |
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In [[physics]], '''pop''' is the sixth [[derivative]] of the [[Position (vector)|position vector]] with respect to [[time]], with the first, second, third, fourth, and fifth derivatives being [[velocity]], [[acceleration]], [[jerk (physics)|jerk]], [[jounce|snap (or jounce)]], and [[Crackle (physics)|crackle]], respectively; in other words, the pop is the rate of change of the crackle with respect to time.<ref>{{cite web | url = https://info.aiaa.org/Regions/Western/Orange_County/Newsletters/Presentations%20Posted%20by%20Enrique%20P.%20Castro/AIAAOC_SnapCracklePop_docx.pdf | title = Snap, Crackle, and Pop | last = Thompson | first = Peter M. | date = 5 May 2011 | website = AIAA Info | publisher = Systems Technology | location = Hawthorne, California | page = 1 | format = PDF | access-date = 3 March 2017 | quote = The common names for the first three derivatives are velocity, acceleration, and jerk. The not so common names for the next three derivatives are snap, crackle, and pop.}}</ref><ref name="Visser2004">{{cite journal|last=Visser|first=Matt|date=31 March 2004|title=Jerk, snap and the cosmological equation of state|journal=[[Classical and Quantum Gravity]]|location=[[Victoria University of Wellington]]|volume=21|issue=11|page=4|issn=0264-9381|doi=10.1088/0264-9381/21/11/006|url=https://arxiv.org/pdf/gr-qc/0309109.pdf|accessdate=17 May 2015|quote=Snap [the fourth time derivative] is also sometimes called jounce. The fifth and sixth time derivatives are sometimes somewhat facetiously referred to as crackle and pop.|arxiv = gr-qc/0309109 |bibcode = 2004CQGra..21.2603V }}</ref> Pop is defined by any of the following equivalent expressions: |
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:<math>\vec p =\frac {d \vec c} {dt}=\frac {d^2 \vec s} {dt^2}=\frac {d^3 \vec \jmath} {dt^3}=\frac {d^4 \vec a} {dt^4}=\frac {d^5 \vec v} {dt^5}=\frac {d^6 \vec r} {dt^6}</math> |
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The following equations are used for constant pop: |
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}} |
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:<math>\vec c = \vec c_0 + \vec p \,t </math> |
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:<math>\vec s = \vec s_0 + \vec c_0 \,t + \frac{1}{2} \vec p \,t^2 </math> |
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:<math>\vec \jmath = \vec \jmath_0 + \vec s_0 \,t + \frac{1}{2} \vec c_0 \,t^2 + \frac{1}{6} \vec p \,t^3 </math> |
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:<math>\vec a = \vec a_0 + \vec \jmath_0 \,t + \frac{1}{2} \vec s_0 \,t^2 + \frac{1}{6} \vec c_0 \,t^3 + \frac{1}{24} \vec p \,t^4 </math> |
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:<math>\vec v = \vec v_0 + \vec a_0 \,t + \frac{1}{2} \vec \jmath_0 \,t^2 + \frac{1}{6} \vec s_0 \,t^3 + \frac{1}{24} \vec c_0 \,t^4 + \frac{1}{120} \vec p \,t^5 </math> |
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:<math>\vec r = \vec r_0 + \vec v_0 \,t + \frac{1}{2} \vec a_0 \,t^2 + \frac{1}{6} \vec \jmath_0 \,t^3 + \frac{1}{24} \vec s_0 \,t^4 + \frac{1}{120} \vec c_0 \,t^5 + \frac{1}{720} \vec p \,t^6 </math> |
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where |
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:<math>\vec p</math> : constant pop, |
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:<math>\vec c_0</math> : initial crackle, |
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:<math>\vec c</math> : final crackle, |
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:<math>\vec s_0</math> : initial jounce, |
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:<math>\vec s</math> : final jounce, |
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:<math>\vec \jmath_0</math> : initial jerk, |
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:<math>\vec \jmath</math> : final jerk, |
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:<math>\vec a_0</math> : initial acceleration, |
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:<math>\vec a</math> : final acceleration, |
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:<math>\vec v_0</math> : initial velocity, |
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:<math>\vec v</math> : final velocity, |
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:<math>\vec r_0</math> : initial position, |
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:<math>\vec r</math> : final position, |
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:<math>t</math> : time between initial and final states. |
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The name "pop", along with "snap" (also referred to as [[jounce]]) and "[[Crackle (physics) |crackle]]" are somewhat facetious terms for the fourth, fifth, and sixth derivatives of position, being a reference to [[Snap, Crackle, and Pop]]. |
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Beyond Pop, higher-order time derivaties are called Huey, Dewey, and Louie [source needed]. However, high-order derivatives of position are not commonly useful. Thus, there has been no consensus among physicists on the proper names for derivatives above pop. |
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==Unit and dimension== |
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The dimensions of pop are '''LT<sup>−6</sup>'''. In [[SI units]], this is "metres per hexic second", "metres per second per second per second per second per second per second", '''m/s<sup>6</sup>, m · s<sup>−6</sup>''', or '''100 [[Gal (unit)|Gal]] per quartic second''' in [[CGS]] units. This pattern continues for higher order derivatives. |
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==References== |
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{{Reflist}} |
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{{Kinematics}} |
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[[Category:Motion (physics)]] |
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[[Category:Physical quantities]] |
Latest revision as of 04:11, 25 March 2020
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