Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Magnets
#1
Reply
#2
I get what you're saying; the Law of Conservation of Energy. No energy can be created nor destroyed.

I've also always wondered this. The energy has to come from somewhere......
Reply
#3
The magnetic energy "made" from a magnetic field is similar to that of an electric current.
Reply
#4
From the electrons in the iron (I forgot what else is magnetic. magnesium?) atoms? How does the Law of Conservation of Energy fit into this? :S
Reply
#5
ok just a few questions answered here:
Why won't the lower magnet thing keep spinning? - the magnets will eventually weaken over a period of time and as they weaken so does the field they create and thus the spinning will slow and stop due to friction, also if that washer is possible to be magnetized, eventually the magnetic field will be imposed upon that washer thus stabilizinge the field
Where does the kinetic energy come from? - essentially the initial force applied, and kept going due to moving the top magnet keeps the bottom one spinning, when friction overcomes the intial force or no force is applied to the top magnet, the bottom will cease to spin.
Where does the energy come from? - the energy leaves the cycle in the form of kinetic energy transferred to the air and heat created from friction with the air and surface the lower magnet comes in contact with.

Why is this not free energy? - 1:There's no way to harness the energy from the spinning magnet due to the fact that as soon as your try to, you cause more friction/drag on the lower magnet thus slowing and stopping the lower magnet from spinning. 2: The magnets lose their energy/degrade over time hence its not exactly free. 3: If you were able to harness the energy (which I don't see any possible way), then you would either have to degrade the magnetic field or input energy to keep the process going as energy cannot be created or destroyed (see law of conservation of energy)
Reply
#6
Magnets were often considered for perpetual motion machines given that their magnetic powers of pulling and pushing seemed infinite and free. Unfortunately, not one perpetual motion machine has been made to date. I think this fits in with the second law of thermodynamics as well.
Reply
#7
I'm familiar with the magnets demagnetizing from the entropy taking over (?), but other than that is there any way for a magnet to lose strength? I still don't get where the magnet gets the energy to move the object. For it to exert a force, doesn't something else have to lose energy? (Or mass, but I don't think magnets are performing matter->energy conversions.) What loses energy?

The concept of how an electromagnetic field exist is what I don't understand, I think.
Reply
#8
Hazzy Wrote:I'm familiar with the magnets demagnetizing from the entropy taking over (?), but other than that is there any way for a magnet to lose strength? I still don't get where the magnet gets the energy to move the object. For it to exert a force, doesn't something else have to lose energy? (Or mass, but I don't think magnets are performing matter->energy conversions.) What loses energy?

The concept of how an electromagnetic field exist is what I don't understand, I think.

Potential Energy. The Electromagnetic Force converts Potential Energy to Kinetic Energy is the simplest way to put it, I guess.

Consider gravity; an object at a certain height will have a certain Potential Energy, the equal of which is the total Kinetic Energy it could have after being accelerated. The higher an object is from ground level, the more Potential Energy it contains. The concept is that Energy had to be exerted to raise the object to that height. The same amount of Energy will be exerted to return it to its original location, i.e. ground level. A free falling object loses its Potential Energy and gains Kinetic Energy.
Reply
#9
How does the Electromagnetic Force convert potential energy to kinetic energy?
Continuing with gravity... I have no idea how gravity works. Higgs Bison or something....?
Reply
#10
I'm not a quantum physicist.
http://en.wikipedia.org/wiki/Fundamental_force
Reply
#11
Hazzy Wrote:I'm familiar with the magnets demagnetizing from the entropy taking over (?), but other than that is there any way for a magnet to lose strength? I still don't get where the magnet gets the energy to move the object. For it to exert a force, doesn't something else have to lose energy? (Or mass, but I don't think magnets are performing matter->energy conversions.) What loses energy?

The concept of how an electromagnetic field exist is what I don't understand, I think.

Gravitons, a fundamental particle. Can't remeber anything about them though, other than they have infinite range but provide the weakest of the fundamental forces.
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)