friction -- exists in a vacuum?
Is it possible for friction to take place in a vaccum?
Sure. Kind of hard to walk on the moon without friction, eh?
With vacuum you actually take away only few ways of friction the main being that of air and a object moving through it.
They had a plan to build special vacuum tunnels with high speed trains in them, train has very little friction as it is rolling on metal wheels on metal track , and if you remove the air you can increase the speed significantly.
Nuts and bolts still work on the outside of the space station.
Under certain conditions cold welding and/galling can occur as what this paper has concluded from the THE GALILEO HIGH GAIN ANTENNA DEPLOYMENT ANOMALY.
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