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Someone please explain this physics concept

  1. Mar 24, 2009 #1
    My teacher had a long metal pole (I believe it was aluminum) and said that it was NOT magnetized. He put a magnet up to the side of the pole and it did not stick, and he dropped a marker through the top of the pole and the marker came out the bottom at a normal rate. However, when he took a magnet and dropped it through the top of the pole, it took a long time for it to come out, maybe 10 seconds. Then it just slipped out the bottom.

    Some one please explain this phenomenon, thanks!!
     
  2. jcsd
  3. Mar 24, 2009 #2

    berkeman

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    Staff: Mentor

    Welcome to the PF.

    Sounds like this may be part of your assignment, to figure out why there is a difference. What are your thoughts? Why would there be a difference between holding the magnet stationary against the non-ferrous metal, versus sliding it along next to the metal?
     
  4. Mar 24, 2009 #3
    Oh sorry I should have explained..

    The only thing I can really think of is that it that the magnet might be trying to set up a magnetic field inside of the pole. It also could be that the pole has a much smaller area for the magnet to go through so it is experiencing the effects of its own field but then again I am not sure that is true..
     
  5. Mar 24, 2009 #4

    berkeman

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    Staff: Mentor

    Boy, it's hard to give a hint on this question without giving the answer away.

    I'll try this, but it may still be too much. Use Google or Wikipedia.org to learn how magnetic brakes work....
     
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