Why is it not possible to make a machine/generator that once started on another fuel can run itself by creating its own energy.
Like the 2 magnets that give perpetual motion.
2007-09-10 01:55:54 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
No PH a magnet rod with a circular magnet placed over it and the magnetic polls fighting each other causes the motion
2007-09-10 02:21:56 · update #1
sorry reread your answer yes
2007-09-10 02:23:30 · update #2
The simplest answer is friction will not allow a perpetual engine.
If you have a generator and an electric motor, put a belt on both shafts, and then hook them together electrically, they should run. Right? The generator should turn because the electric motor runs. The electric motor should run because the generator is turning. Right? No. This is because of friction.
However, if you put something in the loop to store the electricity as it's being generated, say a battery, it will work. This is because although the energy of the battery is being drained, it is contstantly being replaced because of the generator.
2 magnets in perpetual motion? Hmm...I've not heard of this. Are you referring to superconductors? A magnet suspended in between 2 magnets spins because there is no friction.
2007-09-10 02:10:58 · answer #1 · answered by Phurface 6 · 1⤊ 0⤋
Even if perpetual motion were possible, with magnets, springs or whatever, if you then attempted to extract energy from the system, the motion would no longer be perpetual, as the system is losing energy (for your use), and would slow down and come to a halt.
The energy you want has to come from somewhere, as it cannot be created or destroyed.
In your perpetual motion machine, where would the energy you want to drain off for your useage be being topped up from? There always has to be a source to feed your machine.
2007-09-11 06:10:36 · answer #2 · answered by Valmiki 4 · 0⤊ 0⤋
Because at some point in any energy creation technique there is energy lost that isn't an output of the generator. For example, an electric generator loses energy due to friction, heat, and from inefficient transformers. A gas powered generator loses energy from lost heat, friction, etc (pretty much the same).
All methods of producing energy that are currently know to us require more energy put in than you get out. Therefore, they can not be "perpetual". If you figure out a method of making perpertual energy, let me know and we can become the richest people in the world.
2007-09-10 09:08:57 · answer #3 · answered by Anonymous · 2⤊ 0⤋
Because in converting from one type of energy to another, you lose efficiency, and therfore you lose energy. Energy can only be converted to a lower (less efficient) type.
Perpetual motion is a nice idea, but that's it. It's only an idea. I imagine it could be possible one day, but that is still a long way off (centuries) given today's technology, and efficiency levels.
2007-09-10 10:17:29 · answer #4 · answered by Toledo Engineer 6 · 0⤊ 0⤋
Energy can be converted from one form to another but usually with less than 100% efficiency. Even magnets will remain in a fixed relationship unless fresh energy is added to move them. At most, you can get back out whatever energy you put in (unless it turns to heat).
2007-09-10 09:49:34 · answer #5 · answered by Kes 7 · 0⤊ 0⤋
Look up 'entropy' and the Laws of Thermodynamics.
There is no perpetual motion.
Doug
2007-09-10 09:01:49 · answer #6 · answered by doug_donaghue 7 · 2⤊ 0⤋