Why don't we FEEL the Earth Spinning @ 1,000 mph?

Why don't we FEEL the Earth Spinning @ 1,000 mph?

by Math and Science

Formal & Physical Sciences Physics PHDClassical mechanicsPHDTDynamics and statics
🎙 Math and Science 👥 1.8M 📅 December 30, 2025 ⏱ 22 min 👁 287K 📄 science communication 🧭 2026-08-13
Available in: English (current) Français

Keywords

inertiareference framesconstant velocityaccelerationcentripetal force

Summary

The video explains why we do not feel the Earth’s rotation despite moving at high speeds. It begins by noting that at the equator, the tangential speed is about 1,000 mph (1,670 km/h), yet we feel nothing. The explanation centers on Newton’s first law of motion (inertia): objects in motion stay in motion at constant velocity unless acted upon by a force. Since everything around us (ground, air, buildings) moves with us at the same speed, we perceive no relative motion. The video clarifies that we only feel forces when there is acceleration—changes in speed or direction. On Earth, our motion is nearly constant, so we feel no forces. It also addresses the circular motion: we are constantly changing direction, which is an acceleration, but the centripetal force (gravity) is too small to notice. The video uses analogies like a spacecraft and a spinning ball on a string to illustrate these concepts. It concludes that if Earth stopped rotating or gravity vanished, we would fly off tangentially. The presentation is engaging and accessible, aiming to correct common misconceptions.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides a clear and valuable explanation of a common physics question. It effectively uses analogies and visual props to illustrate abstract concepts like inertia and reference frames. The argumentation is logically structured, building from the observation of high speed to the explanation via Newton’s laws. It correctly distinguishes between velocity and acceleration, and explains why constant velocity is imperceptible. The discussion of centripetal force and gravity adds depth, addressing the circular motion aspect. The video successfully debunks the misconception that we should feel the Earth’s rotation, and it does so with scientific accuracy.

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Title / Content Match

The title accurately reflects the content, which directly addresses why we don't feel Earth's rotation.

Quality & Reliability

8/10

The video provides a clear and accurate explanation of basic physics concepts (inertia, reference frames, acceleration) and correctly addresses common misconceptions. The reasoning is sound and aligns with established scientific principles. However, it lacks citations to specific sources and does not delve into advanced nuances, which slightly reduces the score.

Key Moments

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

Contribution & Novelties

The video provides a clear and engaging explanation of a fundamental physics concept, making it accessible to a general audience. It effectively uses analogies and visual demonstrations to convey why we don’t feel Earth’s rotation. The explanation of inertia and reference frames is particularly well done. The video also addresses common misconceptions and provides a solid foundation for understanding Newton’s laws.

Pour aller plus loin :

  • Newton’s laws of motion — Overview of the three laws, including the first law of inertia.
  • Centripetal force — Explanation of the force that keeps objects moving in circular paths.
  • Fictitious force — Discussion of forces perceived in rotating reference frames, such as centrifugal force.

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Radar Profile

The radar profile shows a balanced performance across all dimensions, with slightly higher scores in quality and reliability, and lower in quantity and technical depth. This indicates a well-explained but not overly detailed video, suitable for a general audience.

Reliability 8/10

💬 Très positif. Sur les 30 commentaires analysés, la grande majorité exprime une appréciation enthousiaste, saluant la clarté de l'explication et son caractère pédagogique, avec quelques remarques humoristiques sur la sensation de rotation après consommation d'alcool.