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五个有趣的物理现象

5 Fun Physics Phenomena

五个有趣的物理现象 第一个:让你的朋友为你水平地举一根手杖
– Five fun physics phenomena. Number one, have a friend hold a cane out horizontally
或者其他(跟手杖)相似的物件 然后把你的两个食指放在一起
for you, or another similar object. And putting your two index fingers together, try to place
尝试放在手杖的中心点之下 当放好之后 你会发现它并不像通常那样(稳定)
them underneath the center of mass. When they let go, you will find it doesn’t normally
但是现在试着把两个食指放在手杖的两端
work. But now try putting each index finger at opposite ends of the cane, and then moving
试着将你的食指移向中间
your index fingers in towards the middle. What you will find is that they always end
你会发现它们总是在手杖的重心之下 你可以尝试不对称地移动(手指)
up right under the center of mass of the cane. You can try starting off asymmetrically and
但是它们仍然位于(手杖)重心之下 你可以尝试用不同的速度来移动(手指)
they will still end up under the center of mass. You can try going at different speeds.
非常缓慢地 或者非常快速地 但结果总是完美地如出一辙
Really slowly, or really fast. But you still end up perfectly under the center of mass.
这是怎么做到的? 实验二:旋转手机 你曾经尝试过旋转你的手机吗?
How does this work? Number two, the phone flip. Have you ever tried to spin your phone?
如果你朝这个方向旋转 那很简单 它对齐地很好
If you do it in this direction, it’s pretty easy. It stays nicely aligned. If you spin
如果你顺着它短轴线旋转 你会发现它也旋转得非常好
it along its short axis, you’ll also find it spins very well. But if you try to flip
但是如果你试图像这样翻转你的手机 你就不能轻松完成
your phone end over end like this, you can’t do it cleanly. The phone will never flip simply
手机永远不会(像之前那样)翻转过来 也不会向其他方向翻转
end over end without also rotating in one of the other directions. Even when I make
甚至当我做到了几乎完美的翻转 (然而它还是)越来越不稳定直到沿另外一条轴线转出去
an almost perfect flip, instabilities grow until the phone rotates around another axis.
为什么不行……不 我仍然做不到 为什么它会这样?实验三:你可能看见过
Why can’t… No, I still can’t do it. Why is it so? Number three, you’ve probably seen
如果你在你的头发上摩擦水杯 你会使水杯带电
that if you rub a cup on your hair, you can make it electrically charged. And if you bring
如果你用它靠近水流 实际上你可以导致水流偏转
it close to a stream of water, you can actually cause that stream to deflect. Now usually
这个(实验)被用做在化学课本中以证明水的极性
this is used in chemistry textbooks as a demonstration of the polar nature of water. Water is a molecule
水分子一端显正性一端显负性 发生了什么 你已经知道
with a more positive side and a more negative side, and so what happens, so you’re told,
水分子四处碰撞 所以它的正极转向了杯子的负极
is that the water molecule flips around so the positive side of the water faces the negative
这就是把水吸向杯子的原理 但这不是本质上的解释
side of the cup and that is what attracts the water to the cup. But this is not the
如果你有一块电荷均衡的区域 那么正负极之间
real explanation. If you have a uniform electric field, there’s an equal force pulling the
有一种对等的排斥的力
positive side towards it as there is pushing the negative side away from it. And so you
所以你做不了更多的事来改变分子
can’t actually do more than just turn the molecules. You would need a really, really
你需要一个非常非常强的场强来使分子作用
strong gradient in your electric field to make this work at all, and it basically is
它基本不可能发生在杯子上 那为何水流还是被带电的杯子吸引了?
just not going to happen from a cup. So why is the stream actually attracted to a charged
这就是问题所在 问题四:拿一片你最喜欢的谷物食物并且将它投到一碗水里
cup? That is the question. Number four, take a piece of your favorite cereal and drop it
然后用一块磁力超强的磁铁 尝试将上述谷物拖来拖去
into a bowl of water. Then using a very strong magnet, try to pull the cereal around. Isn’t
酷吗?所以为什么谷物有磁性呢?最后一个,第五个 火箭茶袋
that cool? So why is cereal magnetic? And finally, five, the teabag rocket. Take a teabag
拿一个茶袋 小心地将密封端剪掉 现在倒出茶叶(我们)将茶袋变成了方柱
and cut off the sealed end very carefully. Now dump out the tea. Form the teabag into
然后使方柱平衡站立在盘子内 现在 点燃茶袋的顶端
a square column. And balance it on the plate. Now light the top of the teabag on fire. Try
尝试让它均衡地沿四面八方燃烧 准备好开始起飞 三 二 一 哈 耶!
to light it evenly on all sides. Get ready for takeoff in three, two, one. Ha, yeah!
这就是茶袋火箭的美丽所在 所以它是怎么发生的?
That is the beauty of the teabag rocket. So why did that happen? So how do all of these
上述所有现象的工作原理是什么?通过评论的方式告诉我或者拍一个视频(给我)来解释它们任何一个或者全部的原理吧
phenomena work? Let me know in the comments or make a video explaining any or all of them.
或者订阅这个频道 下周我将会公布答案 我希望你喜欢这些有趣的物理现象
Or subscribe to the channel and I’ll post the answers next week. I hope you enjoyed
我知道一个家伙 他是国际空间指挥部的前任指挥官
those fun physics phenomena. I know a guy who would, the former commander of the international
Chris Hadfield指挥官 事实上晚些时候 我将在悉尼和堪培拉的奥古斯丁与他一起举办现场活动
space station, Commander Chris Hadfield. I’m actually hosting live events with him in late
对此我很期待 现在 悉尼秀的票已经售罄了
August in Sydney and Canberra. I’m so looking forward to that. Now, the Sydney shows are
但是堪培拉的票仍有剩余 所以如果你想去参加的话
all sold out, but there are still as of now tickets to the Canberra show. So if you want
查看描述中的链接 事实上 Chris Hadfield写过一本
to come to that, check out the link in the description. Now Chris Hadfield actually wrote
叫《An Astronaut’s Guide to Life on Earth》的书 并且我将在出去环游世界的时候马上听听它
a book called An Astronaut’s Guide to Life on Earth, and I’m listening to it right now
并且这是极好的 因为它不仅为那些想成为宇航员的人们包含了很多好的建议
as I travel around the world, and it is awesome because it contains great advice not only
对那些想过有意义生活的人也是如此
for people who want to become astronauts, but also for everyone who wants to lead a
如果你喜欢(这本书) 你可以去 audible.com/veritasium网站免费下载
meaningful life here on earth. And you can download this book for free if you like by
或者你可以自己选择一本书进行免费试读一个月
going to audible.com/veritasium. Or you can pick any other book of your choosing for a
Audible是一个很好的服务器 在所有文学领域拥有超过150000件作品
one month free trial. Audible is a great service with over 150,000 titles in all areas of literature,
包括了科幻小说 写实小说和期刊 所以基本上你能从那儿找到任何你想要的(书)
including fiction, non-fiction, and periodicals, and so you can find virtually anything you
并且通过浏览audible.com/veritasium网站 他们会知道是我将你们介绍过去的 然后他们会帮助我
want there. And by going to audible.com/veritasium, they know that I sent you and they help me
继续为你们制作这些免费的视频 所以我十分感谢
out to continue making these videos for you for free. So I really want to thank Audible
Audible支持我 并且我也感谢你们大家的观看
for supporting me and I want to thank you for watching.

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视频概述

手杖如何才能在两根食指之间保持平衡?你的手机会翻跟斗吗?你看见过茶袋火箭吗?你知道水为什么会改变流向吗?而粮食谷物是否又有磁性呢?想知道真相的就赶紧猛戳视频吧!(◦˙▽˙◦)

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收集自网络

翻译译者

樨筠

审核员

嘉言先森

视频来源

https://www.youtube.com/watch?v=1Xp_imnO6WE

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