system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why water is slippy in some situations (wet road for example) and grippy in others (licking the top of your fingers to turn the page of a book for example) ?
gpt
It’s all about relative friction. Friction will decrease slightly when you have a wet road on rubber tires vs dry road on rubber tires. Your fingers normally have oil on the surface, so water on your fingers on paper will have more friction than oil on fingers on paper.

If you had rubber fingers (or rubber gloves on), water will make them more slippery.