Concept Overview
Conservation of Energy
Lecturer Procedure
Steps to Follow
- Place loop of string on finger.
- Allow yo-yo to unroll
- Note return.
Expected Result
Yo-yo will return to about 1/3 of it's original height due to friction, windage, etc.
Variation: Feel free to show off your yo-yo skills!
Historical References; Taken from original work of Percy H. Carr, 1970
“The yo-yo can be used as an accompaniment for remarks about the conversion of mechanical energy to other forms, thus leaving less energy available in mechanical form. If you want to demonstrate your prowess with the yo-yo, this is your chance. Since I have no prowess I usually confine my remarks to the case where the cord is held firmly, and the yo-yo is allowed to unwind straight downward. It will have enough kinetic energy to return itself to about one-third the original height at release. I merely point out the friction, windage and particularly the slippage at the lowest point of the path as the yo-yo suddenly starts to climb as channels where mechanical energy is converted to heat"