Visionary

It's amazing to find some coating materials can have COF of static & Kinetic be equal. Like Teflon, if it's placed on two surfaces COF of S&K = 0.04

I agree. Friction = COF x Normal Force I assumed, by increasing N friction would not increase. But indeed it will, but maybe the limit is when the object breaks.

Ah, I remember in my Physics class that the COF stays constant no matter what, wasn't sure till now. Indeed, if the force of x increases the physical properties of that object could get damaged.

Two surfaces are placed. Surface block with the surface of the ground. The Coefficient of Friction (COF) is 0.1 between them. Friction is because of force acting downwards. The force is = x. By increase "x" to 100 times, will friction increase? I assume yes, but isn't there a limit?

We agreed that there are no magnetic force's acting when moving horizontally. Because the magnetic force act's only perpendicular to the surface. I noticed when moving a magnet over a ferromagnetic surface, only force resisting me is friction. But when I get to the edge,and the magnet is off-set I feel a strong magnetic force attracting the magnet back. There is indeed a weak lateral magnetic force, only at the edge. I'm wondering how could there be a magnetic force laterally and strong at the edge?

To note. There is a magnetic force being applied at the edge. A magnet is placed on the edge of a steel plate, notice there is a lateral force pulling the magnet closer inward. I assume the magnetic field is trying to expand more into the ferromagnetic material.

Thanks Studiot, I knew that. If this new technology is commercialized we can created two surfaces and coat this bad boy on them. And its pure carbon(or diamond), not a good conductor of heat or electricity.

I discovered a carbon coating material that will soon be commercialized. And the numbers are amazing! check this. This coating could make the COF = 0.001 - 0.006 Now that's almost frictionless! My goal is to reach such a number in our mechanics. And I think that will happen very soon!

Is it possible to drop the coefficient of friction from 0.1 to 0.01 or 0.001?

Okay, We got off wrong here. Let's go back, so the burning match is what kind of energy? And the internal energy is the fuel? The output would be = the match + internal energy of the fuel? Studiot your point was not very clear. Please clarify.

What I meant by input energy is the total amount of energy inputted to give out a certain output. The output Im referring to is the large explosion. I assume the internal energy is like a stored energy that is converted to give an output, in our case the internal energy we can categorize it as "input".

Well of course. Ein = Eout But the real world: Ein = Eout + losses

To what limit can I reach with the decrease of the Coefficient of Friction? Say we have a surface that is 0.1, is it possible to make it 0.01 or 0.001? I believe it might be probable. By perfectly(well, semi- perfectly) cutting the surface of the materials, and also adding ultra-lubricants to the mix to get such a result.

Say we have a burning match(Energy in the form of heat + light) and a barrel of Fuel. I threw that match into the barrel got a HUGE explosion out of it! The total inputted energy is the burning match + chemical potential energy in the fuel right? The output would be a larger explosion( that is more heat and light)? Im I getting this right?

Of course it has important uses. But I already know the potential uses of such a systems. However, never knew the methods to reduce the Eddy currents. They can cause a lot of heat, and unwanted resistance to the motion.

Welcome back. This is really interesting, I guess we can agree that it's solvable to deal with Eddy currents now. To reduce them substantially that is. I agree that lamination is best, on those area's where the motion is directed. I just need to study how it works or how it's done. Thank's again.

I've heard and seen multiple idea's of such a "Free-energy magnetic motor", but the good thing is. I don't have to dig into details. Conservation of energy is fundamental principle that makes it easier to debunk such concepts And yes, the idea of a magnet-motor that purely uses magnet in such a way to "expect" energy from nothing or magnetic field's without any input is indeed impossible. Science is the pure study of nature, we never know what he the future holds. My statements are of previous prototypes of magnetic motors that proved C.O.E to be still valid. But a common fact to state: Its a known fact that the work done to slide a magnet over a surface and the work done to pull it off is the SAME, in fact! Sliding it off requires more energy because you are now doing work against friction. A conservative field(In this case since dipoles are involved) are independent of the path taken, the work is always the same. Now about the Eddy currents, there are numerous ways to decrease/increase the resistance. To me, I wanted to discover newer methods to increase it so that the currents would be less. And one of my ideas are small super tiny air gaps that have a resistance of 1.3x10^16 - 3.3x10^16, calculate what even induced EMF(V) you get, divide it by that HUGE number and you will get current(I) that is near zero... So it's really something interesting to discover/research.

After reviewing all of this it seems to make good sense. However, what is the issue of my previous idea? Of the air gaps... Where it could substantially increase the resistance, hence decreasing the eddy currents.

Thank you Studiot. Could you please explain more about the nature of this resistive force(Just to be sure)? I assume the force generated to resist this motion, is a magnetic force of attraction? I understand the factors involved in determining the magnitude of that force. But what happens when a magnet drops through a copper pipe also happens with a iron pipe(ignoring attraction force). But it's really amazing how its possible to have BOTH at the same time.

The relative motion is in a horizontal direction. The direction of the flux/field is perpendicular to the direction of the motion. I'm not sure at what is the direction of the induced EMF. "The part of the table where there is no flux because it is not under the bar magnet provides a retun path for circulatory eddy currents." I think so, yeah.

I don't understand so please bear with me. In order to understand this fully, its best to depict a system. Thanks

Studiot, Please explain what will happen if a slide a magnet super fast over a ferromagnetic surface, that also is a good conductor. What kind of force is acting against my applied initial force(that caused the motion)? Since I don't understand what's going on, or Eddy currents. I think it's best top propose a system, and ask what would happen... Then understand what is what.

Sorry, I didn't understand the concept much, so please bear with me. I don't know why I'm comparing my case like dropping a magnet through a copper pipe, you noticed the decrease of velocity due to the eddy currents, or moving a piece of copper pendulum through a strong magnetic field, there is a counter force acting on motion. What force is that? Isn't it the eddy currents? And the force is a VERY POWERFUL one. Is that the force we're talking about here? Well, in a conductor there is induced EMF, and with ferromagnets emf is generated, a large conductor surface can have this happen. Simply before we into detail, lets talk about this issue in detail. When a magnet slide around a surface of a ferromagnetic material, is there any electromagnetic force at all opposing the change? You say there are losses, please explain the forces involved... Thanks.

Well, I knew that but I had the simplest idea about it. It seems to be more complicated that what I've anticipated... The mechanical resistance isn't it due to the magnetic force that is generated by those "surface" eddy currents that oppose the "lateral" force, since its kind of a "change" to the system. No, I don't. Please do explain. And in my case there can be a very strong force because while sliding the magnet I'm doing it super fast, so that induced those currents and they oppose the change ultimately. I'm more concerned about the magnetite of that force. Thanks

I'm not sure if there is even induced eddy current's that would oppose the sliding force, I just put assume that eddy currents are always induced to oppose the change.