- #1
mathsTKK
- 31
- 0
Hi, everyone ! I am a new member to PF but I find it helpful as people will give ideas and suggestions for me :)
Recently,I come across something called as a magnetic motor. From the design, a few permanent magnets are placed on the edge of a circular disk. Then, as another magnet approaches the disk, the disk spins due to the attraction between the magnet. Due to continuous magnetic attraction, the disk seems able to spin forever, like a perpetual motion machine. However, I realize that the 2nd law of thermodynamics does not allow perpetual motion. So, does the magnetic motor contradict with this law? Besides, I always come across the term ' free energy' which raises my doubt whether it's truly 'free'?
I hope that PF members can help me to clear my doubt. I am truly eager to know the physics and logic behind this contradiction.
Thank you everyone ^^
Recently,I come across something called as a magnetic motor. From the design, a few permanent magnets are placed on the edge of a circular disk. Then, as another magnet approaches the disk, the disk spins due to the attraction between the magnet. Due to continuous magnetic attraction, the disk seems able to spin forever, like a perpetual motion machine. However, I realize that the 2nd law of thermodynamics does not allow perpetual motion. So, does the magnetic motor contradict with this law? Besides, I always come across the term ' free energy' which raises my doubt whether it's truly 'free'?
I hope that PF members can help me to clear my doubt. I am truly eager to know the physics and logic behind this contradiction.
Thank you everyone ^^