yes they do
Knots in My Yo-Yo String was created in 1998.
Yes, and there are people who have contests with them.
There are several ways to put the string on your Yo-Yo, here is one. A yo-yo string is one long string, folded in half, and twisted. The end where the two string meets are tied together to make a loop, eventually used to make a slip knot for your finger. The other end, where the string is folded together is where the yo-yo sits. Untwist the folded end with your fingers in order to separate the two strings. Untwist it large enough that the yo-yo can be placed between the strings, so that a single string sits on the axle of the yo-yo, as shown below. Then simply let the yo-yo string re-twist together. The string is now installed on the yo-yo.
When a yo-yo is hanging motionless from a string, two forces act on the string: tension force, which is the force exerted by the string to hold up the yo-yo, and the gravitational force, which is the force exerted by Earth pulling the yo-yo down. These two forces are equal in magnitude and opposite in direction, resulting in a state of equilibrium where the yo-yo does not accelerate.
You manually wind the string around the yo-yo's axle, creating potential energy. When you release the yo-yo, the potential energy is converted into kinetic energy, causing the yo-yo to spin as the string unwinds.
"Knots in My Yo-Yo String" by Jerry Spinelli has 208 pages.
plastic and string
Yo Yo
The main character in Knots in my yo-yo string is none other than the author, but during his childhood.
your foot
the thing where the string comes from is the o and use the string to make the y
To loosen the knot on a Duncan Butterfly yo-yo, first remove the string from the yo-yo. Then unravel the knot by gently pulling it apart until it comes loose. Be careful not to pull too hard to avoid damaging the string or the yo-yo.