system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : Why does a little bit of water provide grip, while a lot of water provides lubrication.
gpt
Water has a surface tension to it that can lightly adhere to irregular surfaces. It increases the surface area of the contact which has an adhesive force. 

A lot of water acts like a lubricant by getting between two surfaces and resisting their coming together. 

Think of it like many microscopic ball bearings rolling around between two surfaces. 

With just a few ball bearings, they get caught in the nooks and crannies, and increase adhesive force, but with a lot, they roll around in between and reduce friction.