Frictionless surface

[bassplayer142]

Is there anything that stops the formation of a perfectly frictionless surface? There isn't even enough to type to make a second sentence here.

 

[Andy Resnick]

A perfectly frictionless surface is an invented concept. So the answer is that 'everything' stops a surface from being frictionless.

 

[Defennder]

He was asking specifically what causes friction.

 

[tiny-tim]

Isn't a maglev train-track frictionless (if you ignore air resistance)?

And how about something using a superconductor?

 

[suolintu]

Isn't a maglev train-track frictionless (if you ignore air resistance)?

It is, but I don't know if you can really call it a surface as the train isn't touching the track.

He was asking specifically what causes friction.

Basically friction is caused by electromagnetic interactions between the atoms of the two objects.

I quess that in theory, you could have two objects that consist of atoms which have the same electric charge. In that case they should repel each other, thus leading to a frictionless surface (but even in that case only between the two objects). This ofcourse is an ideal situation. In reality, the two objects always have some level of impurity which leads to more or less friction. Even if you could create a pure surface, it would instantly react with oxygen in the air. So in theory it's possible, but in reality it isn't.

 

[bassplayer142]

You guys basically answered my question thanks.