急动度也叫力变率，是加速度的变化率，即位矢对时间的三阶导数。
急动度是研究混沌流的有效工具。
三维相空间是混沌和急动度之间的重要联系纽带。
Three-dimensional phase space is an important relation link between chaos and jerk.
引入急动度和猝变动力学等新概念，用以充实大学物理教学内容，是一种正在形成的趋势。本文提供了一个关于猝变动力学新概念教学的初步框架。
It is a tendency that the new concepts of jerk and jerky dynamics become a part of course of the university physics. A elementary teaching frame of the new concepts on jerky dynamics is constructed.
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