Why is it when you put your hand out the window air feels harder? Because your hand is moving relative fast to the wind. The same thing would happen if you blew fast moving air on your hand. It’d “feel” hard.
The feeling of “hard” is just how much is something pushing on your hand, how much give does it have, etc.
With the toothbrush, it’s moving so fast in a way that if you tried to touch it, it would push your hand away. That’s why it feels hard. When it’s off, it’s not moving, so it doesn’t push.
Technically, everything is pushing. Normal force. Even things that are staying still and you’re grabbing is “pushing” again your hand, causing the feeling of hardness/softness.
Latest Answers