Up and down
Question: How does a yo-yo work? What makes it come back up the string and
how do people perfect the technique of “walking the dog”? Some experts can make
the yo-yo start to climb up the string by holding the string between their
finger and thumb, and hitting this hand with their spare hand. Even if they then
let the string go, the yo-yo still neatly winds it all up.
How do they do this?
Answer: If you examine a modern yo-yo, it consists of two heavy discs that
are connected by a smooth axle. The string…
