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专家说，体重增加是因为运动量减少。
Experts say weight gain results from less movement.
youdao
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我们要再一次假定，动量是守恒的。
Again, we have to assume that momentum is conserved.
youdao
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动能和动量，是完全不同的概念。
Kinetic energy and momentum is a totally different thing.
youdao
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它一定有动量，但它却没有动能。
It must have momentum, and yet it has no kinetic energy.
youdao
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动量效应允许投资者慢慢变富。
The momentum effect allows investors to get rich slowly.
youdao
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我们将要讲，也概念就是动量这个。
We're going to talk about which is the concept of momentum.
youdao
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系统作为一个整体，动量是守恒的。
It's just the system as a whole for which the momentum is then conserved.
youdao
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那么动能和动量，取决于你的参考系。
Now, the kinetic energy and the momentum depend on your reference frame.
youdao
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这有一个旋转的角动量,如你们所见。
We have here the spin angular momentum that you saw.
youdao
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它们有一个，一个总动量。
They have a... together, a total momentum.
youdao
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这是唯一的方法,自然使动量守恒之道。
That's the only way that nature can conserve momentum.
youdao
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角动量现在是在这个方向。
Angular momentum is now in this direction.
youdao
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力是这个方向，旋转角动量是这个方向。
Torque is in this direction; spin angular momentum's in this direction.
youdao
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一旦房价开始上涨，其动量便会迅速累积。
Once house prices start to rise, the momentum can build up quickly.
youdao
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不要混淆动量和能量。
Never confuse momentum with energy.
youdao
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总动量为，两者的矢量和，也就是这个东西。
The net momentum is the vectorial sum of these two, which is this.
youdao
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角动量是这个方向了。
Angular momentum is in this direction.
youdao
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我就是旋转的角动量。
I am the spin angular momentum.
youdao
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观察那个旋转角动量。
Look at that spin angular momentum.
youdao
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注意l，旋转的角动量，已经从这移到了这。
But notice that l, the spin angular momentum, has moved from here to here.
youdao
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所以，这是原本的旋转的，角动量。
So this was originally the spin angular momentum of the wheel.
youdao
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那有很大的运动量。你一定很强壮。
B: That's a lot exercise. You must be really fit.
youdao
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物体1的动量是多少？
What is the momentum of particle number one?
youdao
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所以旋转的角动量是，这个方向。
And so the angular momentum of spin of the wheel is in this direction.
youdao
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这个的动量是多少？
And so, what is the momentum of this one?
youdao
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有了旋转的角动量。
It has spin angular momentum.
youdao
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这个应用程序就是为移动量身定做的。
This is an application that is made for mobile.
youdao
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B那有很大的运动量。你一定很强壮。
B That's a lot exercise. You must be really fit.
youdao
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B那有很大的运动量。你一定很强壮。
B That's a lot exercise. You must be really fit.
youdao