Why does water affect friction differently in different situations?

[ntd252]

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!

 

[A.T.]

So, it is ridiculous, not only reducing friction, but also increase friction, so why?

Without any water you will die of thirst, but with too much water you will drown. Is this also a ridiculous paradox to you, that you cannot understand?

The road is slippery after the rain, because the wheels glide on a water film. On a flooded road the water has to be moved out of the way, so it creates drag. The book page sticks to the wet finger due to adhesive forces.

 

[ntd252]

I know. Read again my post. The book page sticks to the wet finger, because of friction is increased. I want to understand that, why can water reduce friction and increase friction?how does water affect surface between road and car's tire?

 

[A.T.]

The book page sticks to the wet finger, because of friction is increased. I want to understand that,

http://en.wikipedia.org/wiki/Adhesion

how does water affect surface between road and car's fire?

http://en.wikipedia.org/wiki/Lubricant
http://en.wikipedia.org/wiki/Aquaplaning
http://en.wikipedia.org/wiki/Drag_(physics)

 

[PJC01]

Hello Duong, thank you for your questions about friction. I am happy to help explain this concept to you. Friction is the force that resists motion between two surfaces that are in contact with each other. It is affected by several factors, including the type of surfaces, the force pushing the surfaces together, and the presence of any lubricants such as water.

In the case of a slippery road after rain, the water acts as a lubricant between the tires of the car and the road. This reduces the friction between them, making it more difficult for the car to grip the road and causing it to slide. This is why it is difficult to drive on a wet road.

On the other hand, when the road is flooded, the water creates a layer between the tires and the road, increasing the friction between them. This is because the water is pushing against the tires, creating a force that helps the car to grip the road. However, if the water is too deep, it can also create a layer between the tires and the road, causing the car to float and making it difficult to drive.

As for the example of using water on your finger to turn a page, this is because water creates a thin layer between your finger and the page, increasing the friction between them. This allows you to grip the page better and turn it more easily.

So, in summary, the presence of water can either reduce or increase friction, depending on the situation. I hope this helps to clarify your questions about friction. Keep asking questions and learning about science, and have a nice day!