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Finger vs. Fan

  1. Oct 30, 2007 #1
    1. The problem statement, all variables and given/known data
    Hey just a quick question that bothering me:

    how come when u stick your finger in the middle of the fan and let it move it goes in a larger circle?
     
  2. jcsd
  3. Oct 30, 2007 #2

    Shooting Star

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    Only the centre of the fan is not moving. But that's a one dimensional point. All other points on the fan are moving. The tip of your finger is a 2-d surface. Generally, due to friction, your finger will get shifted ever so slightly from the exact centre, and so you'll see it going around in a circle.

    If you press it hard against the centre, you'll see it doesn't move much. But don't try it.
     
  4. Oct 30, 2007 #3
    okay thanks makes sence
     
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