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TheSmartestBanana t1_j0gqq4u wrote

Reply to comment by obog in Does rotation break relativity? by starfyredragon

Centripetal force can only be felt by a point inside the rotating body as well. That point obviously has an acceleration because the directional component of its velocity is changing constantly. The rotating object as a whole is not accelerating and therefore requires no net force. There are a lot of forces that hold an object together, but those forces do no cause an acceleration on that object and therefore cause no force to act on the object itself as a whole.

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atmsk90 t1_j0hgbik wrote

I think there is some confusion between static and dynamic equilibrium here. Centrifugal "force" is simply inertia. It's much easier to visualize by considering a point mass on a massless arm. The arm has to exert a force on the mass not as a result of any applied force from somewhere else, but just as a result of needing to accelerate the mass toward the center of rotation.

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hydroxypcp t1_j0kuo20 wrote

for this question you do have to look at individual particles of the rotating body though. If we take a human body as the rotating body, then the eyes are accelerating and thus not an inertial frame of reference

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