In fact human beings are feeling this exact feeling of weightlessness right now.
Sorry max, no offense but I can't make sense out of this statement since I'm not sure whether you're talking about all of us down here or those guys up there in space ships
The ball "feels" weightless, not just for the instant when it reaches the top, but for the entire trip.
Okay, like I said, I can't remember, so I'll have to take your word for it
This is becoming very interesting indeed (at least to me). What you seem to be saying is that at this very moment except for the force of my chair on my butt, I'd feel exactly the same floating around in a spaceship
Okay, but it's all getting very complex (to me anyhow). Intuition (mine to be sure) suggests that I'd feel ever-so-slightly different on the way up than on the way down. Mind you, I'm only speculating but let's say you're right
So, what you seem to be saying, my graph of acceleration (including of course throw and catch) isn't a sine wave, but after the first quarter cycle it drops instantaneously to zero (air resistance of course notwithstanding), then stays there for, say, what I had imagined as the next quarter-cycle til I catch it, whereupon we get that last half-cycle
(Still one cycle of a sinewave but with the second quarter missing, so to say)
Then what you mean is, because the drop to zero in acceleration when you let go of the ball is instantaneous, that is the reversal in acceleration, is instantaneous, and therefore there was no "moment of motionlessness": but that's what bothers the Intuition (oh yes, again, mine), that instantaneousness, seems to somehow defy commonsense
Why do you think the astronauts in the space shuttle feel weightless?
I had supposed the centrifugal force equalled the gravitational pull, am I wrong
….but what does that have to do with the ball