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

The astronauts share the station’s momentum. Think you sitting on a bus. You’re also unaffected as long as it’s constant speed. You only feel changes in speed – you’re pushed into your seat when the bus speeds up and you’re hurled towards the front if the bus breaks too hard.