Kinetic energy and momentum is a totally different thing.
动能和动量，是完全不同的概念。
Kinetic energy can be destroyed, but momentum cannot be destroyed in the absence of a net external force on the system as a whole.
动能可以被毁，但是动量不能，在整个系统外力，不存在情况下。
Momentum is conserved, because there was no net external force, so now kinetic energy is also conserved.
动量是守恒的，因为它不受外力，因此动能也是守恒的。
Energy can change or cannot change, can increase or decrease or remain the same kinetic energy, but if there are no external forces on the system, momentum is always conserved.
能量可变可不变，可增加或减小，或保持动能不变，但若系统无外力，动量总是守恒。
Nature can deal with kinetic energy one way or another, but it cannot finagle momentum.
自然可以应对动能，以这样那样的方式，但它却无法处理动量。
So momentum is never exactly conserved, and kinetic energy is never exactly conserved either, so it's only an approximation.
动量并不严格守恒，而动能也从不会，完全守恒，它只是一种近似。
It must have momentum, and yet it has no kinetic energy.
它一定有动量，但它却没有动能。
Now, the kinetic energy and the momentum depend on your reference frame.
那么动能和动量，取决于你的参考系。
So now here you see in front of your eyes a case that the wall has momentum, but it has no kinetic energy.
你在这里看到，亲眼看到这个例子，墙壁是有动量的，但它却没有动能。
So what you see here in front of your eyes that kinetic energy can be destroyed, but momentum cannot be destroyed in the absence of external forces.
你眼前所看到的是，动能可被损耗，而动量不会被损耗，若无外力作用于系统。
The momentum of the individual particles gets changed, but the net momentum did not change but the kinetic energy was destroyed.
单个粒子的动量,会发生改变，但是总动量不变,而动能被损耗。
The flow characteristics of inner flow field of turbine are computed with three-dimension incompressible continuous equation, momentum equation and turbulent kinetic-dissipation equation.
采用三维不可压紊流的连续方程与动量方程和紊动能与耗散率方程对内部流场进行研究计算。
These equations involve heat and momentum transports and govern the kinetic evolution of the non-equilibrium system.
这个方程组包含着热输运和动量输运，能够演示这种非平衡态系统的动力过程。
However, the predominant process of secondary ion sputtering is kinetic sputtering, which closely related to the momentum deposition on the target surface (nuclear stopping power).
而主导二次离子溅射的过程是动能溅射，它与靶表面的动量沉积(核能损)过程密切相关。
The forming, diffusion and momentum transfer of the red phosphorus smokescreens and the kinetic characteristic of the different scale particles in smoke cloud are researched in this paper.
本文研究了赤磷基烟幕云团的形成、扩散规律和动量输运，及其烟幕云团中不同尺度微粒的运动性质。
The three-dimensional particle-wall collision mathematical models were founded in the light of the kinetic of rigid and the momentum conservation law, and the effects of wall on the f.
文中根据刚体动力学及动量守恒定理，建立起颗粒–壁面碰撞三维数学模型，并采用此三维数学模型研究了壁面约束效应对细长颗粒流化特性的影响。
It is important to realize that momentum conservation applies even to inelastic collisions, in which the kinetic energy is not conserved.
必须记住，动量守恒甚至对于非弹性碰撞也是成立的，尽管这时动能已不守恒。
It is found that both the momentum coupling efficiency and the overall energy conversion efficiency from light energy to kinetic energy are greater for shorter laser pulses.
实验测得的动量耦合系数和能量转换效率均随脉冲宽度的减小而增大。
The special characteristics of kinetic energy and momentum of horizontal rotary cavity flow in internal dissipating tunnel with an inlet shaft are analyzed.
研究了水平旋转内消能泄水道空腔环流特有的能动量特性。
In turbulence model, the simulation applied finite volume method to solve the mass conservation equation, momentum equation, turbulent kinetic energy equation and turbulent dissipation rate equation.
在湍流模型下，使用有限体积法求解质量守恒方程、动量方程、湍动能方程和湍动耗散率方程。
In turbulence model, the simulation applied finite volume method to solve the mass conservation equation, momentum equation, turbulent kinetic energy equation and turbulent dissipation rate equation.
在湍流模型下，使用有限体积法求解质量守恒方程、动量方程、湍动能方程和湍动耗散率方程。
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