牛顿第二定律实质上是动量连续性方程的积分形式，因而，力可以被理解为动量流。
Forces can be visualized as momentum currents, for Newton's Second Law is equivalent to the continuity equation for momentum in integral form.
该模型是在福克扩散定律和连续性方程的基础上建立的。
The model is constructed using Fick's dispersion law and the continuity equation.
应用物理学中的质量守恒定律、牛顿第二定律、动量定律等，建立了交通流的连续性方程、欧拉方程和动量方程；
Conservation of mass, second Newton's law, and momentum law are introduced into traffic flow to set up traffic continuity equation, Euler's equation, and momentum integral equation.
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