And that's because the desk is exerting an equal and opposite force on you.

我们真正理解牛顿在谈论什么我们真正理解牛顿在谈论什么。

But, as Newton famously said " To every action, there is an equal and opposite reaction" .

但正如牛顿所言，每个作用力都存在与之大小相等，方向相反的反作用力。

By exerting a force downward, an equal and opposite force pushes upward, and the object accelerates.

通过施加一个向下的力，将会产生一个同等的并且反向的向上的推动力，这个推动力促使物体加速运动。

All of your actions are creating equal and opposite reactions, which is the third law of motion in physics.

你的所有行为，都会造成同样和相反的反应，这就是物理中的牛顿第三定律。

Because sound is just waves, you can cancel a sound wave by introducing an equal and opposite wave.

因为声音就是波，你可以通过引入一个大小相等且方向相反的波来抵消一个声波。

Newton's Third Law of motion says that for every action, there is a equal and opposite reaction.

牛顿第三定律是说对于每一个作用力，都存在一个相等的并且方向相反的反作用力。

So there's an equal and opposite force on the rocket, the thing that is actually expelling the gas.

我们真正理解牛顿在谈论什么我们真正理解牛顿在谈论什么。

But direct evidence that it's exerting an equal and opposite force-- is that my hand will get compressed.

我们真正理解牛顿在谈论什么我们真正理解牛顿在谈论什么。

The third law, commonly phrased as " for every action, there is an equal and opposite reaction" , articulates the symmetrical nature of forces.

第三定律通常被表述为“对于每一个作用，都有一个相等且相反的反作用力”，阐明了力的对称性质。

Newton's third law maintains that every action  has an equal and opposite reaction.

牛顿第三定律认为，每个作用力都会产生大小相等且方向相反的反应。

So what is the equal and opposite reaction force?

那么什么是大小相等、方向相反的反作用力呢？

There'd have to be an equal and opposite force instantly transmitted backwards, on my foot.

在我的脚上，必须立即向后传递一个相等且相反的力。

So people often phrase it as, for every action there's an equal and opposite reaction.

所以人们经常把它表述为，对于每一个动作， 都有一个相等和相反的反应。

They stay on until the balance is tilted and equal and opposite amount to the side of pain.

它们会一直保持下去，直到天平倾斜并且与疼痛一侧的量相等且相反。

So the normal force would be equal to mg, but pointing up -- equal and opposite.

所以正常功率是mg，但是 向上的方向… … 用相等和相反的力。

Well, the equal and opposite reaction force is not also are occurring on that molecule.

那么，该分子上并没有发生相等且相反的反作用力。

They're equal and opposite, they do not cancel, they cannot cancel because they're not on the same object.

它们相等且相反， 它们不抵消，它们不能抵消， 因为它们不在同一个物体上。

The rocket is having a force acted on it, once again, equal and opposite.

火箭再次受到一个大小相等、方向相反的力。

But there's an equal and opposite force of the Moon acting on Earth.

但月球对地球有一个相等且相反的力。

For every action there is an equal and opposite reaction, so me cutting the brake lines on his car isn't revenge.

- 对于每一个动作都有一个相等和相反的反应，所以我切断他车上的刹车线不是报复。