The Cup of Water Test, and the Physics Behind It
· 5 min read
There is a well-known way to find out how smoothly someone drives, and it costs about as much as a cup of water.
Put a full, open cup somewhere in the car. Drive. If you arrive with the cup still full, you drove smoothly. If you arrive wearing it, you didn't.
It sounds like a party trick. It's actually a fairly precise instrument, and it's the idea behind Takumi's Cup Challenge in Kamoji.