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cover of episode What would happen if everyone on Earth went to the same place and jumped?

What would happen if everyone on Earth went to the same place and jumped?

2025/1/22
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Moment of Um
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Dr. Kylie Kennedy
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Dr. Kylie Kennedy: 我是一名普林斯顿大学的物理学家,研究宇宙中最微小的粒子。当我思考这个问题时,我想到了两个在溜冰场上滑冰的人。如果你和你的朋友站在溜冰场中央,然后互相推开,你们俩都会朝不同的方向移动。 现在,如果你和一大群人(比如10个朋友和家人)站在一起,然后你推开他们,你会比那10个人移动得更远。他们可能会稍微动一下,但不会像只有你和你的朋友那样远。 你和你的朋友更容易互相推开的原因,以及为什么当你推开你的朋友时,你们会朝相反的方向移动,而当你推开你的朋友和家人时却不一样,是因为我们所说的惯性矩。物体倾向于保持静止,而且物体越大,越难移动。 所以,因为你有一大群朋友和家人,他们比一个人大得多,所以让他们动起来比让一个人动起来要难得多。如果地球上所有80亿人都去了同一个地方,然后说:‘一、二、三,跳!’,那么地球和所有的人都会朝相反的方向移动。所以地球确实会移动。但因为地球比所有其他人加起来都大得多,你甚至不会注意到它。我甚至不知道科学家是否能够精确地测量到这一点。

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There are more than 8 *billion *people living on our big wonderful planet. What if all of those people traveled to the exact same spot on Earth and jumped at the same time? What would happen? Would we move the Earth? We asked physicist Dr. Kiley Kennedy to help us find the answer.

Got a question *jumping around *in your brain? Send it to us at BrainsOn.org/contact), and we’ll find an answer that moves you!