• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Someone please explain this physics concept

  • Thread starter eddy10188
  • Start date
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!!
 

berkeman

Mentor
55,338
5,515
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?
 
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?
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..
 

berkeman

Mentor
55,338
5,515
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..
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....
 

Related Threads for: Someone please explain this physics concept

Replies
2
Views
412
Replies
6
Views
2K
Replies
3
Views
2K
  • Posted
Replies
4
Views
1K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top