Why do rough surfaces create more friction?

Rough surfaces create more friction because they have more bumps and ridges to catch on each other.

Imagine you're trying to slide your toy car across the floor. If the floor is smooth like a shiny tile, the car zooms along easily, it’s like sliding on ice! But if the floor is rough, like a bumpy carpet, the car stumbles over all those lumps and slows down. That's friction working hard.

Think of two pieces of paper. If they're both smooth, you can slide them past each other with just a little push. But if one is covered in sandpaper, super rough, it’s like trying to drag your toy car through a gravel pit! The bumps and ridges on the rough surface grip the other surface more tightly, making it harder for them to move past each other.

So when two surfaces are rough, they have more places to catch and hold on. That means more friction, and less sliding, just like your toy car struggling on a bumpy floor!