What if we lived in a world without friction? Well, it would probably make everything really difficult. And I mean really difficult. One thing that would be made near impossible to control would be transportation. The very way we walk depends on friction between the ground and our feet or shoes, so if we tried walking, we'd slip, fall over, and slide indefinitely across the ground until we make contact with either a flat surface to push off of, or a round surface, like a street lamp, where you could change direction by hooking your arm around and moving in circular motion. Now if that sounds even somewhat amusing, also consider this, what happens if you go too fast? Well since friction couldn't be there to slow you down, you'd either painful hit a solid surface and change direction, or if you hit something softer, like a pillow or something, it might be able to cushion the impact.