1. Our cars would get much better gas mileage without tire and air friction.
2. There would be no more skinned knees if friction didn't exist. (Like when you are skating or playing football.)
3. We wouldn't have to worry about clothes chaffing us in dry weather if there were no friction.
4. We could do some pretty amazing dance moves without friction. (The Electric Slide would last forever....)
5. Our shoes would last a lot longer without friction.