We is me...or common mortals like me. Not everyone has your expertise swansont, relax.
I am talking about the centrifugal force, because it is rarely mentioned as the cause of weightlessness in the ISS astronauts case. The case of free falling is when there is only gravity acting, but in the case of a satellite, shuttle or ISS, you need rockets to move that fast, that's why I would say that they are spinning, they are not free falling. Example, if you are dropped inside an elevator, you are free falling vertically (not spinning around the earth), at about 300 km/h, and the weightless sensation, in this case, is given by the free fall, your feet don't stay on the floor, and if you try to drop an orange, it won't go to the floor, but will float in front of you. Second example, you are inside an aircraft travelling at a constant 300 km/h, just like in the free falling elevator, but I guess you won't feel any weightlessness sensation, you stay seated, and if you try to drop an orange it will fall down on the floor. Third example, you are on a roller coaster, going up fast, at the top of the track, for a moment you will feel weightless, lifted out of the seat, the orange will stay afloat. Which of these example can be associated to the astronauts weightlessness? To me only the third example, for the ISS men it will feel like and endless "top of the roller coaster hill".
Yes, the cannonball example is useful to understand why things can spin around the earth, but it doesn't make you understand the weightlessness sensation inside a ship.