leonardo da vinci : the codex leicester

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under what conditions can a person on a see-saw not jump up?

When two men with the same weight stand on either end of a see-saw, the see-saw is evenly balanced. If either man jumps up, he will, through the force of his leap, propel his side of the see-saw downward. Hence the man who jumps does not gain height, but rather propels his partner upward. The weight of the partner assures that the end of the see-saw remains under the feet of the man who jumps.

 

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trennlinie

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?

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