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另一些物理误解 – 译学馆
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另一些物理误解

Another Physics Misconception

我敢打赌你在学校学的是动量等于质量乘以速度
I bet you learned in school that momentum is mass times velocity.
我确信!
I sure did!
然而 当物体以接近光速的速度移动时
However, for objects moving close to the speed of light,
像大型强子对撞机中的粒子或光本身
like the particles in the Large Hadron Collider or light itself,
这个等式就不再正确
this equation is no longer accurate.
相反 我所谈论到的等式
Instead, we use these equations that I talked about
将在“E=mc^2不完整”这个视频里详细介绍
in more detail in the video “E=mc^2 is incomplete”.
如果你把它们当做出发点来解决动量问题
If you take them as your starting points and solve for momentum,
你会发现有质量物体的动量等于它们的质量乘以速度
you’ll find that objects with mass have momentum equal to their mass times velocity,
除以根号下1减速度的平方除以光速的平方
DIVIDED by the square root of one minus velocity squared over the speed of light squared.
如果你的速度远小于光速的话
That square root part doesn’t make much difference
那么有无平方根差异不大
if your velocity is small compared to the speed of light,
因为v除以c约等于0
because then v over c is really small
而1减去0还是等于1
and 1 minus something small is basically just 1,
所以动量p等于mv除以1 也就是mv
so momentum (p) is pretty much just mv divided by 1, which is mv,
这就是为什么你在学校里学的是p=mv的原因
which is why you learned in school that momentum is mass times velocity.
1905年前 科学家也是这么想的 但现在他们知道这是不对的……
That’s also what physicists thought before 1905, but now they know that’s not quite true…
你也是如此!
and so do you!

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视频概述

动量p=质量m×速度v 事实的确如此吗?来看看你对这个等式有什么误解吧

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翻译译者

IllUSION

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视频来源

https://www.youtube.com/watch?v=4B_x1XjBhiI

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