Interesting question... - page 10

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Sharika.
 
In this case, they are equal, hence the hovering
 

No, they are not. The ball is pressed against the ceiling.

No kidding, that's what happens, the ball rolls slightly backwards as it starts to move and then accelerates forwards.

 
Different aspects of this experiment keep coming to mind. There is another one. The density of a balloon may be greater than the density of air, and it may hang under the ceiling due to the force of a potential difference. Simply put, the balloon is electrified.
 

And the vertical component can be eliminated

Helium, hydrogen, hot air - whatever

 
gip >> :

No, they are not. The ball is pressed against the ceiling.

No kidding, that's what happens, the ball rolls slightly backwards as it goes, and then accelerates and rolls forwards.

No, reread the conditions

and let it catch zero at about 1cm from the ceiling for clarity.

>> it doesn't make a difference and it doesn't make a difference.

 
Mischek писал(а) >>

Do you agree that a balloon has mass?

Yes, of course.

And it consists of the mass of helium and the mass of the shell m+m0. When the train moves, a force will act on this mass, directed against the motion of the train and equal to the product of the acceleration by the mass of the ball. The Archimedean force is proportional to the same acceleration (see figure) and directed in the opposite direction. Whatever the acceleration, the sign of the resultant force will be determined by the difference between V*(air density-helium density) and (m+m0)= V*(air density-helium density)-(V*helium density+m0)= V*{air density-2*helium density}-m0>0 since the same expression is greater than zero for the vertical force pushing the ball against the ceiling and it will cause the ball to move against the direction of acceleration.

 

You have it all more fresh in your head, of course, but in my opinion it is impossible

First of all, the Archimedean force doesn't apply here (I'm talking about the horizontal part of the problem).

I think there are only two forces.

One, as you say, F=ma

and the second is the impact of air in the direction of movement

and the second one depends only on the shape and area of the ball and has nothing to do with its contents.

but the first one has mass.

Accordingly a 10 g ball and a 100 kg ball (of identical size) would move in the opposite direction but with different velocity.

 
A simple experience. The flame of the lighter is like a balloon. We cover the top with a clear glass - it's like a carriage. When you start moving, the flame deflects in the direction of acceleration.
 
admin >> :
A simple experience. The flame of a lighter is like a balloon. We put a transparent glass on top of it and it looks like a carriage. When you start moving the flame is deflected in the direction of acceleration.

It didn't go anywhere.

and with analogies, you could lose the original problem.

so the only thing to do is go buy some balloons and get on the train.

so it can be misunderstood )

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