An example I can think of is that a wet floor is slippery, but putting a sock onto a wet foot is impossible.
Another example could be that a wet rock is slippery (less friction) but water could also add MEGA friction for sharpening a blade.
An example I can think of is that a wet floor is slippery, but putting a sock onto a wet foot is impossible.
Another example could be that a wet rock is slippery (less friction) but water could also add MEGA friction for sharpening a blade.
Comments
I’m not sure about your sock example, but the water for sharpening a blade doesn’t add friction. For sharpening that uses water – you’re probably thinking of using a sharpening/grinding wheel – it’s for temperature control, as well as removing debris (bits of metal that get removed as part of the sharpening process). When using a whetstone, you’d actually use oil to do that debris removal, which certainly illustrates that you’re not doing it for added friction!
In the case of your socks on feet, basically the water interacts wuth the surfaces by adhesion.