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Help explaining physics demonstration

  1. Dec 10, 2008 #1
    In my last class the professor had a bike tire with a string attached to its axle. When the tire was hung from the string it sat parallel to the floor; however, when it was spun and hung from the string it remained perpendicular to the floor and rotated around the string. What was it that kept the spinning wheel up?

    . . . []. . . . . . . . . . . . . . . []
    . . . []. . . . . . . . . . . . . . . []. @
    . . . []. . . . . . . . . . . . . . . []. @
    . . . []. . . . . . . . . . . . . . . []_@_
    . . . .|. . . . . . . . . . . . . . . . . @
    @@@@@@. . . . . . . . . . . . . .@
    . . . .|. . . . . . . . . . . . . . . . . @

    @ = tire
    [] = string
    | and _ = axle
    . . = nothing
    tire on right is the one spinning
     
    Last edited: Dec 10, 2008
  2. jcsd
  3. Dec 10, 2008 #2

    Mapes

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    Its relatively large angular momentum (see gyroscope).
     
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