If EVERYONE on Earth Jumps at Once Something Weird Happens

If EVERYONE on Earth Jumps at Once Something Weird Happens

by Math and Science

Formal & Physical Sciences Physics PHDClassical mechanicsPHDTDynamics and statics
🎙 Math and Science 👥 1.8M 📅 June 2, 2026 ⏱ 15 min 👁 19K 📄 science communication 🧭 2026-08-13
Available in: English (current) Français

Keywords

Newton's third lawconservation of momentummass of Earthjumpingforce

Summary

The video explores the thought experiment of all 8 billion people on Earth jumping simultaneously. It begins by explaining Newton’s third law of motion, emphasizing that forces always come in pairs and act on different objects. The presenter clarifies that when you jump, you push the Earth down, and the Earth pushes you up. The Earth’s recoil is imperceptible due to its enormous mass. The video then considers two scenarios: people jumping scattered across the globe, where forces cancel out, and all people gathered in one location. For the latter, using conservation of momentum, the Earth would recoil at about 2 x 10^-13 m/s, moving less than the width of a hydrogen atom in one second. The video also addresses the possibility of causing an earthquake, concluding that the energy is far too small. It compares to the 2011 Japan earthquake, which shortened the day by 1.8 microseconds. The video concludes that while the Earth’s movement is undetectable, the thought experiment illustrates fundamental physics principles and our connection to the planet.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides a clear and engaging explanation of Newton’s laws and conservation of momentum, using relatable analogies like ice skaters and a trampoline. The argumentation is logically sound, building from basic principles to the specific calculation. The presenter effectively communicates the counterintuitive result that even all of humanity’s collective jump would have a negligible effect on the Earth. The value lies in making complex physics accessible and sparking curiosity.

Scientific Rigor, Source Quality, Title Accuracy

The video does not cite external sources, but it relies on well-established physics principles. The calculations are correct and consistent with standard physics. The title accurately reflects the content, and the video stays on topic. The presentation is scientifically rigorous for a general audience, with no apparent errors or misleading statements.

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Title / Content Match

The title is catchy and accurately reflects the content, which explores the hypothetical scenario of everyone on Earth jumping simultaneously.

Quality & Reliability

8/10

The video presents a well-structured explanation of Newton's laws and conservation of momentum, with correct calculations and clear analogies. The content is scientifically accurate, though it simplifies some aspects for a general audience. The presenter is an experienced educator, and the video includes no misleading claims.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Contribution & Novelties

The video offers a fresh perspective on a classic thought experiment, emphasizing the negligible effect of human action on a planetary scale. It effectively uses analogies to explain abstract concepts.

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Radar Profile

The radar profile shows high scores in quality and reliability, with moderate scores in quantity and technical level. This indicates a well-explained, scientifically accurate video that is accessible to a general audience, though it may not delve deeply into advanced mathematics.

Reliability 8/10

💬 Positif. Sur les 30 commentaires analysés, la majorité exprime de l'appréciation et de l'enthousiasme pour l'explication, certains ajoutant des calculs ou des questions complémentaires, tandis que quelques-uns apportent des critiques constructives ou des remarques humoristiques.