一些地质学家想知道，是否可以用构成断层的岩石来解释没有摩擦产生的热量。
Some geologists wondered whether the absence of friction-generated heat could be explained by the kinds of rock composing the fault.
如果没有摩擦力，如果没有其他力，只有重力。
If there is no friction, if there are no other forces, only gravity.
若这棒上没有摩擦力，那么。
要是没有摩擦力，我们就不能行走。
没有摩擦力，汽车就不能开动。
没有摩擦力的作用，汽车就不能前行。
An automobile could not move itself without the aid of friction.
假设现在没有摩擦力。
没有摩擦力，皮带传动的机器就无法使用。
In the absence of friction belted machinery would not be used.
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.
现在没有摩擦力。
如果没有摩擦力，那么一个在运动的物体永远也不会停下来。
If there were no friction, an object in (motion) would never come to a rest.
没有摩擦力，皮带就不能将动力从一台机器传送到另一台机器。
In the absence of friction, belts would not be capable of conveying power from one machine to another.
这里没有摩擦力；物体可以毫不费力地移动；而且它们不会出差错。
There is no friction; things move around effortlessly; and they do work.
如果断层裂开，也不会发生地震，因为没有摩擦力把它们合到一起。
If faults opened up, no earthquake would occur because there would be no friction to lock them together.
总而言之，要是没有摩擦力的话，我们的世界真会变得非常奇怪了。
At any rate, but for friction our world would be very strange indeed.
离合器主动件、从动件上没有弹簧作用力，因此主动件和从动件之间也没有摩擦力。
There is no spring pressure on the clutch assembly parts. So there is no friction between the driving members and driven members.
钉子能钉住木头，螺丝能拧住木头或金属，都是由于有摩擦力，如果没有摩擦力，它们就毫无用处。
Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless.
首先，我用了机械能，守恒定律-，这里没有摩擦力-，我会向你们展示，这，和功能定理完全一致，现在你会怎么做呢？
I used first the conservation - of mechanical energy — there was no friction — and then I showed you that it's completely consistent with the work-energy theorem, so what would you do now?
你们可以看到,有件事非常值得注意,可以注意到,方向的速度，is，that，the，velocity，in，the，x，direction,在整个轨迹当中-,如果没有空气阻力，也没有摩擦力-,是不会改变的。
Now, when you look at this there is something quite remarkable and the remarkable thing x - throughout this whole trajectory-- if there is no air draft, - if there is no friction-- is not changing.
若摩擦系数真的，与接触面积没有关系，那么两者下滑时的角度，应该基本相当。
If indeed the friction coefficient is independent of surface area, then when I tilt them they should start to slide roughly at the same Angle.
它一直是相同的,如果没有任何摩擦力,我假想,不存在摩擦力。
That will always be the same if there is no friction of any kind and I have to assume that there is no friction.
如果没有起粘着作用的摩擦力，几乎只有很小的可能性让你只靠腰和一条腿倒挂在钢管上。
Which, without that sticky friction, might be a (small) possibility when you're hanging to a strippers pole upside down attached only by your waist and one flailing leg.
它未曾变过,如果没有空气阻力,或任何摩擦力。
That never changes if there is no air drag or air friction of any kind.
如果摩擦力没有那么大的话，这台泵本来是不会坏的。
If the friction had not been so great, the pump would not have been damaged.
但如果在门铰链突然断掉之后，由于门框突然倾斜而门板没有倒塌，这个门板可能会由于一小点摩擦力而暂时支撑住了。
But if after the door hinges snap but the door cannot fall because the frame suddenly skews, the door might get temporarily held in place by friction, by a pinch.
如果摩擦力没有那么大的话，这台泵本来是不会坏的。
零摩擦系数意味着没有剪力发生，且接触面自由滑动。
A zero friction coefficient means that no shear forces will develop and the contact surfaces are free to slide.
而且其结构可以没有滑道大幅度的减少摩擦阻力。
Friction resistance can be greatly reduced because no slide way is arranged.
你既没有防滑护垫也没有不干胶贴纸导致浴缸表层静摩擦系数低，因此摔倒也不足为奇。
Not surprising. You have no safety mat or adhesive stickers to allow for purchase on surface with a low coefficient of static friction.
如果没有了摩擦力，我们的房屋就会坍塌。
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