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