Hello everyone! I am Duong (Dương), I am from Vietnam, 16 years old. So my English grammar isnot good, i am sorry! I have some problems about friction, I can't understand. First, when the road is slippery after the rain, the car or orther verhicles (in the road) are very difficult to drive. This means "water reduces friction between the hire with the road." Second, when the road is flooded, the car is difficult to drive, too. this means "water increases friction" Beside, we use small water in the finger to turn the page of the book, it means that water increases friction, too So, it is ridiculous, not only reducing friction, but also increase friction, so why?i need explaining Thank you very much! Have a nice day!