This Is Friction!
You kick a ball. How far will it roll? When will it stop? It depends. If it lands on rough grass, it will stop soon. If it lands on a smooth playground, it will keep rolling.
Friction will stop the ball. Friction is a force. A force is a push or a pull.
Friction happens when two objects, or things, rub together. Rough surfaces have more friction than smooth surfaces. Sand is rough. Ice is smooth. Sand has more friction than ice. It is hard to push a sled on sand. It is easy to push a sled on ice.
Why is it easy to slip on a wet floor? Water makes the floor very smooth. There is not much friction.
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