Without friction the world would be very different! It would be so strange in a bad and good way.....
For a start, walking would be different because when you put your weight on the foot behind you there would be nothing to stop it sliding. You would fall over and not be able to walk. It would be very hard to get around. You could consider blowing yourself around but it still wouldn't work. Taking in a breath, you would slide forward and then blowing out, you would slide backward!
Having no friction when walking could also be a huge advantage. …
