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For the ball problem, Earth's acceleration is constant.
For the ISS question, this topic has come up before
with true weight (mg)
and apparent weight (scale reading).
If you jump off a cliff, the bathroom
scale reads zero. No apparent weight, but gravity (mg) is still acting and
makes you accelerate.
Easy to show this in class.
Makes sense to students.
So the orbiting satellite is similar, or seems to be similar.
Einstein
said a person in free-fall has no sensation of weight, but what makes her
fall?