• Hard to predict but the center of mass behaves decently.

    很难预测质量中心稳定运动。

    youdao

  • I have here a triangle, and I have no clue where the center of mass is.

    这里有个三角形知道,重心在哪里

    youdao

  • We want to know what the velocity is of the center of mass of the other one.

    我们知道质量重心速度多少,对于一个

    youdao

  • And so we have here a squash racquet and we have here the center of mass.

    这里有一只壁球,这里是质量重心

    youdao

  • Okay, I'm going to do the same thing, and now look at that center of mass.

    我会同样现在质量重心

    youdao

  • So this is a disk, and we just discussed the rotation about the center of mass.

    圆盘我们讨论过,绕质心旋转

    youdao

  • But the center of mass is below the rope, and so there is really no danger.

    重心低于绳子所以没有危险

    youdao

  • This, by the way- it's not so obvious — is also the velocity of the center of mass.

    顺便提一下-并不明显-,也是质量重心速度

    youdao

  • And then you can really see that the center of mass moves in a very civilized way.

    可以看到质量重心非常稳定运动

    youdao

  • In this case, it will rotate about the center of mass, so it's not static equilibrium.

    这个例子里着重心旋转因此存在静力平衡。

    youdao

  • Can you see that the center of mass is moving very uniformly, or can you not see that?

    看到物体重心吗,它稳定运动你们能看到吗?

    youdao

  • I'm going to explain to you now what we physicists mean by center of mass of a system.

    现在你们解释物理学家系统重心

    youdao

  • Then as the star moves around the center of mass, you see that all these lines drift in unison.

    随着恒星在,质量中心转动,能看到所有这些线一致得移动。

    youdao

  • And this gives the center of mass some amazing properties that I will discuss with you now.

    使质量重心,有一些神奇特质一会儿你们讨论。

    youdao

  • So now we're going to turn off the lights and I want to show you the motion of the center of mass.

    我们关上你们展示质量重心运动

    youdao

  • For example, take a disk center at the origin, well, the center of mass should be at the origin.

    个例子,一个圆心原点圆盘重心应该原点。

    youdao

  • But the center of mass — - you see it when I balance it on my finger — is way below the suspension point.

    重心-,你们可以看到-,悬挂下方

    youdao

  • And, now, I think I know just by looking at the picture where the center of mass of this circle will be, right?

    这样的话观察张图片,中心在哪就可以知道

    youdao

  • And where the two lines intersect-- - could be in this opening-- that's where the center of mass is located.

    条线交点-,可能这个空间-,就是重心所在处

    youdao

  • If you ever want to move yourself to the center of mass, you will have to know what the center-of-mass velocity is.

    若想移动重心体系中,你必须知道,重心速度是多少。

    youdao

  • If you have a car or if you have an object like this, then it is, of course, much harder to calculate the center of mass.

    若是类似东西那么当然会,很难计算质量中心

    youdao

  • Make v2 zero, and you see exactly that you see here the same result, so this must be the velocity of the center of mass.

    使v2为,显然知道,在这里同样结果,它必然重心速度

    youdao

  • What I can do now, I can suspend it like this, and I know that the center of mass must be below my finger. Did you notice?

    现在的,我可以这么悬挂,我知道重心,肯定手指下看到了吗?

    youdao

  • So to get into the center-of-mass frame, you must subtract the velocity of the center of mass from the initial velocities.

    进入重心体系,你就必须减去速度重心速度,原始速度中减去。

    youdao

  • Ten kilograms is ten meters below the rope, so clearly the center of mass of the system as a whole will be below the rope.

    绳子下方1010公斤所以很明显重心会在绳子下方。

    youdao

  • And so the center of mass will just laugh at us and ignore all these motions and will travel at a constant speed very nicely.

    重心嘲笑我们它忽略所有运动,它会匀速运动。

    youdao

  • And that's exactly what you see comes out of these equations whether you go to the center of mass or whether you do it from 26.100.

    就是你们看到两个方程里得到无论是质量重心还是26。100实验

    youdao

  • On our spherical Earth, gravity pulls "down" us toward the planet's center of mass. So on a flat surface, we naturally stand up straight.

    我们地球上,重力我们星球质量中心因此平坦地表我们自然站得

    youdao

  • We did a demonstration there with two vibrating objects with a spring, but yet the center of mass was moving with a constant velocity.

    我们演示的,弹簧连接两个振动物体但是质量重心保持稳定速度。

    youdao

  • But the basic idea is, then, that the center of mass will always in stable configuration line itself up below the point of suspension.

    但是基本概念,物体重心一直处于稳定结构线上悬挂下面

    youdao

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