Why is there no friction in vaccum?
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Friction is a surface effect and doesn't depend upon there being air. There is also a force like air resistance from the very sparse gas in space, but it will be very, very small, since space is a very good vacuum. ... So, yes, friction can exist in space and on other planets, but a normal acceleration is needed.Friction, caused by things in physical contact with each other, is largely absent in space. Space is almost totally empty, so there is no "road" for the space ship to rub against. ... There is no air resistance in space because there's no air in space.We wouldn't be able to walk, but we would also be able to move for very long periods of time over long distances due to the lack of friction slowing us down. ... Not only would there be a lack of friction between surfaces, there would also be a lack of air resistance due to the loss of molecular friction.Friction exists in space, just that not in the most familiar cases. Walking or rolling are not normally possible without gravity pushing both bodies in contact with a normal force. However the normal force does not have to be only gravity, it could be caused by pressure or some other force (thrusters, magnetism etc).One of the most fundamental tenets of modern physics is that in a perfect vacuum - a place entirely devoid of matter - no friction can possibly exist, because empty space cannot exert a force on objects travelling through it.