The force is always perpendicular to the direction of motion.
因为这个力总是垂直,于运动的方向。
Water in motion is a very powerful force.
水的流动是非常强大的力量。
Physics studies force, motion, heat, light, sound, electricity, magnetism, radiation, and atomic structure.
物理学专门研究力、运动、热、光、声、电、磁、辐射和原子结构。
By friction is meant a force opposing motion.
摩擦力指的是阻碍运动的一种力。
This force, which we call friction, always opposes motion.
这种总是阻碍运动的力我们称之为摩擦力。
The fuel rack requires little force to accomplish its motion .
油泵齿条几乎毋须费力就能使之移动。
From within the object or the force, there is no way to tell if you're in motion.
因为当你身处物体或者力量内部的时候，你是无法确定自己是不是处于运动中的。
Mechanics is a science dealing with force and motion.
力学是一门有关力和运动的科学。
The relationship among acceleration, force and the motion direction is discussed.
讨论了加速度与受力、运动方向之间的关系。
Engine: a machine that converts energy into mechanical force or motion.
引擎，发动机：把能量转化为机械力和运动的一种机器。
Should we want to accelerate the motion, we should have to apply some force.
如果我们要使运动加速，就得施加某种力。
The force due to the motion of molecules tends to keep them apart.
分子运动引起的力能使分子分离。
The fuel rack requires little force to accomplish its motion.
油泵齿条几乎毋须费力就能使之移动。
In this paper we present a virtual force guidance system for motion planning.
本文给出了移动机器人的虚力导航和运动规划系统。
The motion of variable mass system under variable force is studied using air track.
在气垫导轨上研究了变质量物体在变力作用下的运动规律。
Fluid motion caused by an external force such as gravity.
由重力等外力引起的流体运动。
No motion has she now, no force;
她失去了力量，也没有了动静；
A heavier object requires more force to set it in motion.
比较重的物体要使他动起来就需要更大的力。
Is the motion with even variable velocity the result of constant force?
匀变速运动是恒力作用的结果吗？
Is the motion with even variable velocity the result of constant force?
匀变速运动是恒力作用的结果吗？
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