leonardo da vinci : the codex leicester

why doesn't viscous water flow continually throungh a bent pipe?

it can be observed that water that is viscous and slow-moving, and that therefore usually has great inner cohesion, does not flow continually through a bent pipe, although the inner cohesion suggests it should. moreover, a simple experiment can also demonstrate that the water will flow without interruption through the bent pipe only when the outlet of the pipe lies lower than its entrance.

moving

1. why does something move?
2. how can flowing water consume its momentum when it encounters an obstruction?
3. why are the waves of descending rivers slower than the water flow of the river itself?
4. why does a body move when something strikes it?
5. under what conditions can a person on a see-saw not jump up?
6. why does waves look like crescents when viewed from the side?
7. what happens to the waves when water crashed into an obstacle?
8. what effects do the slope of the obstruction and the angle of impact have?
9. why doesn't viscous water flow continually throungh a bent pipe?
10. does the weight of water vary according to how one changes the slope of a pipe filled with water?
11. how can one see that movement separates from its cause?
12. where does the wave break?
13. what causes cyclones?
14. can a special dam influence the impact of the water?
15. what must an especially strong dam look like?
16. how can one simulate the collapse of a wave?
17. how does air, once it is immersed, escape the water?
18. what machine can be used to ram piles into the ground?