We know that there is friction.
我们发现了摩擦力。
那么，究竟什么是摩擦力呢？
现在没有摩擦力。
Friction can remove kinetic energy.
摩擦力可以转移动能。
To add friction to the system.
为了增加系统的摩擦力。
It's said under great friction.
据说在受到很大的摩擦力之后。
Friction must take kinetic energy out.
摩擦力一定抵消动能。
I'd like to read science friction.
我喜欢阅读科幻小说。
想要改变摩擦力？
为什么摩擦力不起作用？
我们需要摩擦力。
I assume that there is no friction for now.
假设现在没有摩擦力。
Were there no friction, we could not walk.
要是没有摩擦力，我们就不能行走。
By friction is meant a force opposing motion.
摩擦力指的是阻碍运动的一种力。
If there is no friction at all in this bar, then...
若这棒上没有摩擦力，那么。
Today we're going to talk about friction, something...
今天讲摩擦力。
Changes in your home environment may cause friction.
家中环境变化可能会引发矛盾。
What will the friction be, how large, and in what direction?
那摩擦力是多少，什么方向？
Compared to, say, a wooden floor, ice has much less friction.
对比起木地板来说，冰面的摩擦力要小得多。
If it were not for friction, our houses would fall apart.
如果没有了摩擦力，我们的房屋就会坍塌。
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。
This is a way that you can measure the static friction coefficient.
这是测量静摩擦，系数的一种方法。
If there is no friction, if there are no other forces, only gravity.
如果没有摩擦力，如果没有其他力，只有重力。
An automobile could not move itself without the aid of friction.
没有摩擦力的作用，汽车就不能前行。
That never changes if there is no air drag or air friction of any kind.
它未曾变过,如果没有空气阻力,或任何摩擦力。
The advantage of rolling bearing is that they cause less friction.
滚动轴承的优点是它产生的摩擦力较小。
How much is the coefficient of friction between the tire and ground?
轮胎与地面间的摩擦系数是多少呢？
"There is just too much friction in getting capital to flow," he says.
他说：“获得这些用于周转的资金真是太难了！”
The maximum friction has this little m in it, and that's independent of d.
最大摩擦力和m有关,和d无关。
However, if we make use of the friction, then we can have a stable situation.
若我们利用摩擦力，就能得到稳定状态。
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