Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

This Object ALWAYS Spins Counter-Clockwise, why?

  1. Sep 11, 2012 #1
    Hey guys,

    I've read these forums a ton over the years and found everything I needed merely by searching. But alas, the day has come where I've needed to create an account to help me with a problem.

    I have to determine why this object ALWAYS spins counter-clockwise. Whether you spin it clockwise, tap it, push it - it doesn't matter... pretty bizarre.

    Here are some picture and appreciate the help:

  2. jcsd
  3. Sep 11, 2012 #2


    User Avatar

    Staff: Mentor

    What you said kind of doesn't make sense. When you spin it clockwise it spins counterclockwise?

    And can you give more details about what it is? Where did you get it?
  4. Sep 11, 2012 #3


    User Avatar
    Science Advisor
    Gold Member

    See this article: The Amazing Rattleback!

  5. Sep 11, 2012 #4

    D H

    User Avatar
    Staff Emeritus
    Science Advisor

    The author of that page missed Thomas R. Kane, the author of modern dynamics theory ("Kane's method"). He and David Levinsion published "Realistic Mathemaical Modeling of the Rattleback" in 1982. This paper preceded both Hubbard's and Bondi's papers.
  6. Sep 11, 2012 #5
    Thanks for the leads guys!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook