航天飞机重返地球大气层时因有摩擦力而减慢速度。
The force of friction slows the spacecraft down as it re-enters the earth's atmosphere.
磁悬浮不依赖于车轮在轨道上的摩擦力。
风向在城市里也会改变，因为建筑物增加了它们周围流动的空气的摩擦力。
Wind movements are also modified in cities because buildings increase the friction on air flowing around them.
这种毡制品只是为了消除与塑料产生太多的摩擦力，或者让它与外壳稍微分开。
This felt thing there is just to avoid too much friction from building up with the plastic or to keep it slightly separated from the case.
这种毡制品只是为了消除与塑料产生太多的摩擦力，或者让它与外壳稍微分开。
This felt thing there is just to avoid too much friction from building up with the plastic or to keep it slightly separated from the case.
它们的腿有点弯曲，脚尖上有小钩，提供足够的摩擦力，使它们能在湿滑的环境中活动。
The legs, which are slightly curved with tiny hooks on the tips of their feet to provide enough friction to enable movement in a slippery environment.
雨滴落在太阳能电池板上，然后滚落下来，此时它与电池板表面产生摩擦力，这种摩擦力可以转化为电能。
When a raindrop falls on the solar panel and then rolls down, it creates friction on the surface of the panel, which can then be turned into electricity.
因此，地质学家们想知道，断层内部的加压水袋是否会使板块之间的摩擦力减小，从而使板块彼此远离。
Geologists therefore wondered whether the friction between the plates was being reduced by pockets of pressurized water within the fault that push the plates away from each other.
这些属性包括物体的密度和摩擦力。
These attributes include the density of the object and the friction.
所以摩擦力做负功-，转化成热能。
我们知道在生活中，摩擦力抵消动能。
摩擦力会调整自身大小，使系统保持平衡。
The friction will adjust itself so that there is equilibrium if nothing is going.
改变的是，最大摩擦力。
这两种力量分别是，空气阻力和冰面摩擦力。
Its is actually acted upon by two forces, air resistance and friction resistance with the ice.
和轨道,总会有一些摩擦力，当然和空气也是。
There is always a little bit of friction with the track, for one thing, and also, of course, with air.
摩擦力是怎么做的？
但是动量守恒，因为这里的，摩擦力都是内部的。
But momentum is conserved, because those frictional forces are all internal.
摩擦力则阻碍下滑，因此存在，此方向的摩擦力。
Friction prevents it from doing so so there's going to be a frictional force in this direction.
最大摩擦力变大。
旋转它，然后看，摩擦力抵消动能，转化成热能。
I'm rotating it, and you see that friction is taking out kinetic energy and it's converting it to heat.
就是摩擦力。
对吗？没有摩擦力，没有非保守力，所以这个式子成立。
Right? There is no friction, there are no nonconservative forces, so this has got to work.
指纹有一个作用——它们可以为手指抓东西提供摩擦力。
Fingerprints serve a function - they provide traction for the fingers to grasp things.
摩擦力在达到静力，平衡中起了很大作用，情况就是这样。
So the friction plays an essential role for us to get static equilibrium, and that is often the case.
对于这种电子油门踏板装配来说，摩擦力必须能够达到要求。
It is both essential and desirable to have a certain defined degree of friction in these electronic gas pedal assemblies.
所以只有当,摩擦力,小于或等于最大值的,时候才不会倒。
So now the situation is only safe as long as the frictional force is smaller or equal to the maximum value possible.
这足以抵消保持岩石不动产生的摩擦力，使得岩层轻易移动。
This might be enough to counteract the frictional force that holds the slabs of rock in place, making it easier for faults to slip.
它们是由橡胶制成的，能够增强在岩石上的摩擦力。
They have rubber synthetics that greatly enhance one's friction on the rock.
物体运动，并向上加速度，因为摩擦力方向斜上，值为这个。
It is moving, so sure, it's going to be accelerated so the frictional force is in this direction, has this value.
如果你转一个陀螺，你会发现因为摩擦力，陀螺不会永远旋转。
If you spin a top, that we know that the top will not last very long because of friction.
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