Why does a rolling ball eventually stop without external force?

A rolling ball slows down and stops because something inside it fights against its motion.

Imagine you're running on a playground, and your best friend grabs your hand and gently pulls you backward, even if no one is pushing you. That’s what happens to the ball: tiny parts inside it are like that sleepy friend, slowing it down little by little until it can’t move anymore.

Even though the ball isn’t touching anything else, its surface has tiny bumps and ridges, like a rough carpet. These bumps rub against the ground as the ball rolls, and this friction is what makes the ball lose speed over time.

Think of it like sliding on a rug versus sliding on ice: the rug slows you down more because there’s more rubbing. The same thing happens to the ball, the more it moves, the more those tiny bumps work together to stop it.

So even without anyone pushing or pulling, the ball still has hidden forces working against it, making it eventually come to a stop, just like you would if your sleepy friend held you back for too long!