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yungman
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- How to explain magnet
This is not homework, just a question of curiosity. Something that came to my mind last night.
Say I have a magnet and a piece of iron. Say I use it to do weight training exercise. I stick the magnet on the wall and stick the iron on the magnet. Say it takes 100lbs of force to pull the piece of iron away. So for exercise, I keep pulling it off, then stick it back on, then do it again as exercise.
I am doing work. If the magnetic stay as strong over long period of time( say it's a natural magnet). Meaning I can keep doing this exercise forever. That means the magnet has infinite amount of energy that will not be used up!
Is my assumption wrong that the magnet can last forever? Or there are other reasons?
Thanks
Say I have a magnet and a piece of iron. Say I use it to do weight training exercise. I stick the magnet on the wall and stick the iron on the magnet. Say it takes 100lbs of force to pull the piece of iron away. So for exercise, I keep pulling it off, then stick it back on, then do it again as exercise.
I am doing work. If the magnetic stay as strong over long period of time( say it's a natural magnet). Meaning I can keep doing this exercise forever. That means the magnet has infinite amount of energy that will not be used up!
Is my assumption wrong that the magnet can last forever? Or there are other reasons?
Thanks