Why can we feel earthquakes but not feel the Earth moving through space?

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I know that we cannot feel Earth’s motion because we are moving with it (i.e. riding in a car with closed windows analogy) but why can we feel the forces on Earth like earthquakes? If we are moving with Earth, shouldn’t we “move” with earthquakes (as they are movements in the Earth’s crust) and therefore not be able to feel them?

Please don’t guess the answer. Only answer if you actually know what you’re talking about lol. I feel like I answered my own Q in my explanation but I need someone more knowledgeable to articulate it in simple words. Thanks!

In: Physics

7 Answers

Anonymous 0 Comments

I see a few people in this thread saying that we feel acceleration, but that’s not exactly true. Astronauts on the International Space Station are accelerating towards earth at 8.7 m/s^2, but they don’t notice that acceleration at all because the space station is accelerating at the same rate. The “feeling” comes from relative motion.

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