So I mentioned to you that the motion of the center of mass is very uniform in the absence of external forces, and that I can demonstrate for you again with the air track.
我向你们提到过,重心的运动是稳定的,若不受外力，我可以再次演示,在空气轨上。
A drop's existence can be understood in terms of its individual water molecules, the particular forces between them, and the general physical laws governing motion: quantum mechanics (QM).
在理解一滴水的存在时，可以依据它单个的水分子、分子之间的特定力量以及约束运动的一般物理法则，即量子力学。
It swirls, as circular motion in air masses is the response to conflicting forces, as seen in the circular motion of tornadoes and hurricanes.
就如我们所看见的龙卷风和飓风进行着圆形运动，由于气团应答着相互冲突的力量，大气层也在进行旋转运动。
Dynamics is a technical term. It is the scientific study of motion, energy, and forces.
动力学是一个专业用语。它是关于运动，能量，与力的科学研究。
Software calculations for FPSO motion responses and mooring forces of various mooring point positions are also presented.
并用软件计算了系泊位置变化对FPSO运动响应和系泊力的影响。
Conclusions the magnitude of cutting forces could be greatly influenced by the motion direction and tendency of the handpiece.
结论手机的运动方向和趋势在一定程度上影响了切削力的大小。
Laboratory physical model tests were performed to study the performances of the motion characteristics and the mooring forces of pontoon floating breakwater models.
实验结果表明浮箱的相对板宽和锚链刚度是影响模型运动和锚链力的重要因素。
Postmodern Human knowledge is founded on (has evolved from) a Science which studied the motion of particles and their forces in Space and Time (Metaphysics of Space and Time).
后现代主义的人文知识是建立在粒子运动和时空力学的基础上(时间与空间的形而上学)。
The scientific study of the motion of bodies and the action of forces that change or cause motion is called dynamics.
对物体运动及改变或引起运动的力的作用的科学研究叫做动力学。
Follow these steps and you will find that you have set into motion forces that allow you to deepen your sense of self-worth.
遵循以上步骤，你将会发现你已经开动了加深自己我价值感的力量。
Looking for a simple, quick demonstration of forces and acceleration in circle motion?
看过一简单、快速的演示圆周运动中力和加速度的变化吗？
The generalized force and generalized inertia coefficient may also be calculated by finite difference method, and so the actual motion of mechanisms subjected to known active forces may be analyzed.
用有限差分法还可求出机构的等效力（矩）和等效质量（转动惯量），从而可求解机构在已知外力作用下的真实运动。
The complex forces on cage of the high - speed cylindrical roller bearing has been analyzed, and the collision dynamics model and dynamics motion equation of the cage have been set up.
分析了高速滚子轴承中保持架的复杂受力，建立了保持架的碰撞动力学模型和保持架的动力学运动方程。
In this paper, by analyzing the forces on hydrofoil catamaran, the mathematical model of its heaving and pitching motion is proposed.
从高速水翼双体船受力分析的角度，提出了其静水中垂荡和纵摇运动的数学模型，其中对水翼所产生的升力进行了较为详尽的分析。
A integrated equation set for solving plane parallel motion of rigid body was derived, and the conditions of system of forces simplified on the center of mass plane was discussed.
给出了解决刚体平面平行运动问题的一组完整方程，讨论了力系简化在质心平面内的条件。
Based on the geometrical properties of the constrained system in configuration space, the motion and the constraining forces of robot system are studied.
基于在位形空间中受约束系统的几何性质，对机器人系统的运动及所受的约束力进行研究。
Detailed analysis of forces received by motion platform is done by using Newton-Euler and Lagrange methods synthetically.
综合运用牛顿—欧拉方法、拉格朗日法对运动平台受力情况进行了详细分析。
And we are led to infer that, if all the impeding forces of gravitation and resistance could be removed, there is no reason why the ball, once in motion, should ever stop.
由此可以推论，如能去除一切起阻碍作用的引力和阻力，就没有理由认为，球一旦处于运动中还会再停下来。
According to the theory of modern new system economics, the motion of a social activity depends on the resultant forces of formal system arrangement and informal system arrangement.
根据现代新制度经济学理论，一项社会活动的运行是正式制度安排与非正式制度安排合理作用的结果。
A new viewpoint that the under-actuated process bases on the re-allocation of the driving forces and the motion pairs has been proposed.
提出了欠驱动的过程是驱动力和运动副重新分配的过程这一观点。
The system is simplified into single degree of freedom dynamics model with piecewise linear restoring forces and square damping, then the piecewise nonlinear motion equation of ALT is established.
将该系统简化为单自由度分段线性恢复刚度，含平方阻尼的动力学分析模型，建立了铰接装载塔的分段非线性运动方程。
An appropriate control law was selected that forces the system states to reach the sliding manifold in finite time and has low chattering in the sliding motion.
选择适当的动态不连续控制律保证了系统状态在有限时间到达滑模面，并有效的削弱了抖振。
And a body in motion needs to resist external forces acting upon it that might slow it down.
运动中的身体需要抵挡外界施加的压力，不然就会被压垮。
The external forces and moments of the parachute and projectile are analyzed completely. A two body motion model of the TSP system, which is composed of the parachute and projectile, is established.
恰当地引入了降落伞的附加质量和附加惯性矩，完整地分析了伞体和弹体所受的外力和外力矩，建立了由伞体和弹体组成的末敏弹系统二体运动模型。
If you have been unemployed and looking for work, employed and hoping to make a change, or self-employed and looking for new business, the new moon on February 13 will set powerful forces in motion.
如果你现在失业并在找工作，或有工作但希望改变，或自雇者希望有新业务，2月13号的新月会给予你强大的推动能量。
His diagnosis of bewitchment put into motion the forces that would ultimately result in the death by hanging of nineteen men and women.
他认为生病是由于巫术的诊断最终导致了19个男人和女人被处以绞刑。
His diagnosis of bewitchment put into motion the forces that would ultimately result in the death by hanging of nineteen men and women.
他认为生病是由于巫术的诊断最终导致了19个男人和女人被处以绞刑。
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