# Jerk, Snap, Crackle, and Pop

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#### AroraBorealis

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<p>Okay well im taking a physics class at my highschool and&nbsp;our instructor was touching on the subject of&nbsp;change in&nbsp;velocity being acceleration and the change in acceleration due to alltitude is called&nbsp;jerk. Well then he went on to explain that change in jerk due to reasons im not aware of&nbsp;was called snap then the&nbsp;change in snap was the crackle and the change in crackle was the pop. I was like woh i couldnt even&nbsp;rap my head around a change in jerk to&nbsp;be snap so i was wondering if someone had a semisorta&nbsp;simple explanation for snap and maybe the rest of them.&nbsp;</p> <div class="Discussion_UserSignature"> </div>

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#### DrRocket

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Okay well im taking a physics class at my highschool and&nbsp;our instructor was touching on the subject of&nbsp;change in&nbsp;velocity being acceleration and the change in acceleration due to alltitude is called&nbsp;jerk. Well then he went on to explain that change in jerk due to reasons im not aware of&nbsp;was called snap then the&nbsp;change in snap was the crackle and the change in crackle was the pop. I was like woh i couldnt even&nbsp;rap my head around a change in jerk to&nbsp;be snap so i was wondering if someone had a semisorta&nbsp;simple explanation for snap and maybe the rest of them.&nbsp; <br />Posted by AroraBorealis</DIV></p><p>I think your teacher was pulling your leg.&nbsp; </p><p>When you get a little more mathematics, the notion of "change" will be replaced by the mathematical notion of a "derivative".&nbsp; But the basic idea is correct.</p><p>The derivative (with respect to time) of position is velocity.</p><p>The derivative of velocity is acceleration.</p><p>You don't have to go any further to formulate the science of mechanics.&nbsp; Position, velocity, and acceleration are enough.&nbsp;</p><p>The derivative of acceleration is called "jerk", but you will be hard pressed to find a discussion of it in a text on mechanics.&nbsp; It does, I believe, sometimes come up.&nbsp; But I have never actually seen it used in many years of technical work in the aerospace and defense industry.&nbsp; You may well never see it again.</p><p>I have never heard of formal definitions of "snap", "crackle" or "pop" in mechanics.&nbsp; I presume that they would be higher derivatives.&nbsp; I think that is really just nonsense. </p><p>My advice:&nbsp;Concentrate on position, velocity and acceleration and the rest of Newtonian mechanics.&nbsp; That is enough to get you through all university levels, including the Ph.D.&nbsp; It worked for me.<br /></p> <div class="Discussion_UserSignature"> </div>

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#### emperor_of_localgroup

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Okay well im taking a physics class at my highschool and&nbsp;our instructor was touching on the subject of&nbsp;change in&nbsp;velocity being acceleration and the change in acceleration due to alltitude is called&nbsp;jerk. Well then he went on to explain that change in jerk due to reasons im not aware of&nbsp;was called snap then the&nbsp;change in snap was the crackle and the change in crackle was the pop. I was like woh i couldnt even&nbsp;rap my head around a change in jerk to&nbsp;be snap so i was wondering if someone had a semisorta&nbsp;simple explanation for snap and maybe the rest of them.&nbsp; <br /> Posted by AroraBorealis</DIV></p><p><font size="2">Is this the lowest point of high school physics? I have to wonder what qualifications do these teachers have that allowed them to teach physics anywhere.</font></p><p><font size="2">Are force, momentum, impulse totally gone from high school physics?&nbsp; Do they have to use terms like snap, crackle and pop to get to students' minds? How far is the death of science in our high schools?&nbsp; I always said 'don't bring down science to street levels, bring the students up to the science level'.</font></p> <div class="Discussion_UserSignature"> <font size="2" color="#ff0000"><strong>Earth is Boring</strong></font> </div>

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#### vogon13

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<p>&nbsp;</p><p>I had a high school instructor who would just go off on total bizarro tangents if he noticed no one in the class was paying attention.&nbsp; And then some of that stuff would turn up on a test, and if you regurgitated it back in an answer you would flunk.</p><p>&nbsp;</p><p>At the time, I thought he was a jerk (he never caught me that way, BTW) but now, I might have similar aspirations.</p><p>&nbsp;</p><p>&nbsp; </p> <div class="Discussion_UserSignature"> <p><font color="#ff0000"><strong>TPTB went to Dallas and all I got was Plucked !!</strong></font></p><p><font color="#339966"><strong>So many people, so few recipes !!</strong></font></p><p><font color="#0000ff"><strong>Let's clean up this stinkhole !!</strong></font> </p> </div>

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#### a_lost_packet_

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<p>I can't find the correct notation for "snap", "crackle" or "pop" at NIST.</p><p>But, I did find a lot of information about breakfast cereals.&nbsp; Perhaps it's outside of International Standards and used exclusively in referring to measurements regarding puffed rice? </p> <div class="Discussion_UserSignature"> <font size="1">I put on my robe and wizard hat...</font> </div>

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#### DrRocket

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>I can't find the correct notation for "snap", "crackle" or "pop" at NIST.But, I did find a lot of information about breakfast cereals.&nbsp; Perhaps it's outside of International Standards and used exclusively in referring to measurements regarding puffed rice? <br />Posted by a_lost_packet_</DIV></p><p>Yeah.&nbsp; It is kind of funny here.&nbsp; But it is not funny if some idiot high school science teacher is presenting this to young students as though it is serious and useful.</p><p>It is only funny to an audience with enough background and sophistication to recognize the comic aspect and not be taken in.</p><p>I can sympathasize a bit since I had a ninth grade science teacher who , on a test expected students to select the (multiple choice) answer to the questions "The rotation of the earth causes ________" to be "wind".&nbsp; I had to spin a globe and hold a flashlight to convince this nut case that the answer "day and night", WHICH WAS ONE OF THE CHOICES, was acceptable.&nbsp; He never did recognize that is was the only correct answer.</p> <div class="Discussion_UserSignature"> </div>

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