What is Pseudoforce?
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The technical definition is: a pseudoforce is one that is not observed by all inertial observers. So what does that mean?:
Many people can watch a physical process and get different observations. With Einstein’s general relativity, even the order and timing of things may depend on the observer. However, there are many things that all _initial_ (that is: non-accelerating) observers can agree upon, such as causality (“which event caused which”, if at all).
One example is centripetal force, everyone moving at a constant rate could measure that a weight swung around on a rope does so because the rope pulls on it. But someone inside the weight experience the fictitious pseudo centrifugal force, which happens only because they are not inertial, they are constantly swung around.
Often even called a _fundamental_ force, the most important pseudoforce is actually Gravity! By our modern understanding of Gravity coming from bending space and time, something “influenced” by gravity actually flies straightforward, it’s just the underlying fabric of nature that makes this the way it is. And indeed, an astronaut on the ISS experiences no forces, they just freely and inertially move through space (and time)!
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