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The 1st Law of Thermodyamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing.
The second law of thermodynamics states that "the entropy of an isolated system does not decrease". This is often taken to mean that "disorder always increases" and is frequently misinterpreted. Another way of putting it is "an isolated system's ability to do work decreases over time". The second law provides the thermodynamic arrow of time in that one can tell the difference between the past and the future by looking at the amount of entropy in the closed system.
originally posted by: bbracken677
a reply to: Kaiju
What will maintain this magnet motor's motion? Without some form of energy input it will not run that long.
I would think the offset magnetic pull would start it spinning on its own. At most it would take a gentle nudge. It's similar to what makes bubbles and balloons go up, slightly more pressure on one side than the other. In the case of the magnets, slightly more pull.
First, you need to input energy to get it started.
I don't think friction or resistance would become a factor until you got it spinning at higher speeds, then yes, for sure. The only issue I can imagine with the magnets is that they would tend to shift their poles from axial to crosswise over time reducing their effective attraction. Other than that I can't see how they would work against me.
Why? Mainly friction and resistance. The magnets will work against you as much as for you in your setup.
You are trying to build, in effect, a perpetual motion machine. It's been done many times before. Rather..it's been attempted many times before. Doesn't work. Great idea, but physics is geared against it.
A perpetual motion machine (in theory) runs forever without the need for additional energy inputs beyond what it takes to set it in motion initially. Even if you managed to pull off that impossible task, when you begin to take energy from that system .. well, it would stop... cause you took energy from it. You would actually have to produce more energy than is being input. Nothing does that.
I don't think friction or resistance would become a factor until you got it spinning at higher speeds...
originally posted by: Kaiju
The wheel will gain speed with each revolution, until friction limits it.
What do you think? Think it could work?
I guess my question should be; do you believe the wheel would spin on it's own until the magnets gave out? Or do you think it will run only until the initial input energy is exhausted?