Slide a muslin cloth past wet hands. If your hand is too wet, the cloth gets wet as well and would let your hand easily slide past. If your hand is dry then the cloth will easily slide past as well. But… If your hand is just a little wet, there is enough friction to have the cloth stuck to the hand.
The right kind of friction
The right kind of friction
The right kind of friction
Slide a muslin cloth past wet hands. If your hand is too wet, the cloth gets wet as well and would let your hand easily slide past. If your hand is dry then the cloth will easily slide past as well. But… If your hand is just a little wet, there is enough friction to have the cloth stuck to the hand.