自由落体是指，唯一作用力是重力的情况。
Free fall is when the forces acting upon you are exclusively gravitational.
这将导致作用力产生一个扭矩，使球旋转。
This causes the applied force to act as a torque, which therefore gives the ball a spin.
其它的温室气体的作用力总和是1瓦特/平方米。
在美国- 17号上，中船体充当抵消这个作用力的梁。
On USA-17, the middle hull serves as a beam to counteract those forces.
对短期气候作用力的控制要比应付二氧化碳简单。
And doing something about these short-lived forcings is easier than tackling carbon dioxide.
根据功的原理，阻力与距离的乘积等于作用力与距离的乘积。
From the principle of work, the product of the resistance times its distance equals the product of the effort times its distance.
然而如果遇上足够强大的反作用力，经济动力将会迅速消失。
Yet economic momentum is quickly dissipated if it meets strong-enough counterforces.
把表面粗糙化也可能是减小飞机反作用力一个办法。
There may also be a way to cut aircraft drag by making some surfaces less slippery.
处于静力平衡的物体，仅仅所有作用力之和，为0是不够的。
For an object to be in static equilibrium, it is not enough that the sum of all forces is zero.
如果这种情况是正确的，那就意味着进化的核心存在反作用力。
If this picture is correct, it means that there are opposing forces at the heart of evolution.
中微子的相互作用力很弱，对我们日常生活没有影响。
They are extremely weakly interacting particles that have zero effect on our everyday lives.
比如，当飞机的螺旋桨疾驰过云层时，会给云一个向后的作用力。
When a plane's propeller, for example, spins through a cloud, the propeller exerts a rearward force.
我们写在这，原子核带正e的电荷，我们看到作用力。
So, an electron has a charge of negative e, we've written here and the nucleus has a charge of positive e.
更为重要的是，环境对物种的作用力通常不会很快显现。
What's more, any such effects of nurture (environment) on a species' nature (genes) were not supposed to happen so quickly.
我通常的研究是同样是调查海啸作用力沿海岸线的距离是怎样变化的。
My current research is also investigating how tsunami forces change with distance from the shoreline.
工人们在检查用于探测罕见宇宙粒子微弱作用力的光传感器。
Workers inspect light sensors that detect the watery impact of rare cosmic particles.
这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。
Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.
她说：“既然这样我们为什么不动脑筋模拟与生育相似的作用力呢？
"But why aren't we thinking of mimicking the effects of childbirth?" she said.
海浪的作用力向其底部及侧部挤压，这股压力向上传递至冰山的表面。
Wave action applied pressure to the bottoms and sides, and the pressure propagated up through the ice to the surface.
由于碳纳米管呈规律状排列，他们能够从不同的方向对材料施加作用力。
Because of the regular alignment of the nanotubes, they were able to stress the material from various directions.
然而，作用力是不会停止的，因为重力都会存在，我马上会向你们展示。
Here, however, the torque will never stop because this Mg will always be there, and I will show that to you shortly.
然而勤劳的催产素受体，因个体差异，外形不同，对人体的作用力也不同。
Yet the precise contours of oxytocin’s hardworking receptor differ among individuals, to apparently noticeable effect.
因此，暗物质一定存在，而且星云团的碰撞产生的作用力将暗物质同普通物质相分离。
Thus, dark matter must exist, and it was wrenched apart from normal matter by the force of the collision of the clusters.
重力和其它基本作用力如电磁力之间的关系，是物理学长期以来最引人关注的奥秘之一。
One of the longest outstanding mysteries in physics is how gravity is related to the other fundamental forces, such as electromagnetism.
我们所看到的这些差异并不是由于智力和大脑的不同…是社会作用力下的产物。
And that these gender differences that we are seeing are not because they have different brains..
在每个步骤中，我们计算每个原子受到的作用力，然后根据牛顿第二法则更新速度和位置。
At each time step, we calculate the forces on each atom, then we update the velocities and the positions according to Newton's second law.
到此刻为止叫所谓的大统一时期，此刻开始，超力逐渐分划成我们今天看到的部分作用力。
The so-called Grand Unification Era, at the end of which the superforce begins to break apart into the constituent forces we see today.
最终结果是这里这里，这里这里和那里，物体上没有作用力，物体也没有移动，它呆在原地。
So the net result is that here, here, here, here and there there is no force on the object at all so the object is not going to move, it's going to stay put.
为了便于比较各作用力，用瓦特/平方米表示气候作用力，值越大则温度上升越多。
Climate forcings are, for the sake of comparison, expressed in terms of watts per square metre: more watts, more warming.
现在调查人员说太阳和月亮的对圣安德列亚斯断层的作用力刺激了地底，产生震动。
Now researchers say the tug of the sun and moon on the San Andreas Fault stimulates tremors deep underground.
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