1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    User Avatar
    Homework Helper

    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook