So, the other day I was walking down my driveway after it had just rained. I was in a rush to get to school because I have physics everyday, which I just love so much. While on the way to my car I slipped and fell. I fell due to the low amount of friction my shoes against the slippery driveway had, or in this case didn't have. The smoother something is, the less friction it has. This is called the nature of the surface. Kinetic friction is what friction while sliding is called and static friction is not sliding.