Originally Posted By: Harry Potter
@ventilator: Your perpetuum mobile looks nice, but it would not work. wink

Even if we assume that the valves are perfect (which is not possible without additional energy), it will not work.

Because it only works when the left tube is completely filled with water. But in a completely filled tube there is not enough space for the ball. When the ball rolls into the tube filled with water, the water cannot expand because of the closed valves. So the pressure of the water would be too high. The ball would bounce off.


on the upper side there wouldn't have to be a valve at all. you could use something like a basketball that jumps out of the water. hm... but the ball would always take some water with it too. tongue