How is it the ISS can travel at 17,400 MPH, but astronauts seem unaffected at all?

Question

EDIT: Thank you all for your kind yet informative responses!

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Answer 1

I guess you could compare it to riding a car.

Lets say you’re in a car going 50 mph, you don’t really feel like your going 50 mph, and because you’re in the car you are also going 50 mph. But when the car brakes suddenly or slows down a lot in a short amount of time, you lean forward because unlike a car that has the ability to slow down or go from 50 to 0 in seconds, our bodies can’t slow down that quickly.

Probably the only way astronauts in the ISS would feel how fast they’re travelling is if the ISS were to move faster or suddenly stop.