[Skywise]

(09-08-2015, 09:12 PM)Island Chris Wrote: Hi Gang,

Lovely daughter posted the following:

http://buam.tumblr.com/post/128205999469...to-nobodys

Very nice write up and demonstration.

Might I also suggest looking up adhesion, and hydrogen bonding.

https://en.wikipedia.org/wiki/Adhesion
https://en.wikipedia.org/wiki/Dispersive_adhesion
https://en.wikipedia.org/wiki/Hydrogen_bond

Water is a polar molecule. Because of the shape of the molecule it has positive and negative electrical poles. Like magnets, this is what makes water molecules stick to each other (cohesion), but it also what makes water stick to other substances (adhesion).

But ultimately I think this is still all Van der Waals forces.

(09-08-2015, 09:12 PM)Island Chris Wrote: Note that, as a nerd, I have only one side of my shirt tucked in on the video.

You're just starting a new fashion trend!

(09-08-2015, 09:12 PM)Island Chris Wrote: This is the same science as what causes earthquakes on faults. Fluid pressure should make the fault (or the table) weaker. What we saw was the opposite.

I'm not sure it would be the same. On the table, you are comparing the friction between the two surfaces with and without the presence of the water. But underground, water is always present, is it not? I thought it had more to do with pore pressure; that is, the pressure of the water present in the spaces. I might have this backwards, but I thought that increased pore pressure pushed rock particles apart, reducing friction from asperities, tending toward fault failure.

Brian