* Friction: When you push something across a rough surface, you encounter friction. Friction is a force that opposes motion between two surfaces in contact.

* Rougher Surfaces, More Friction: The rougher the surface, the more friction there is. This is because the irregularities on the surface interlock, creating resistance to movement.

* More Force Needed to Overcome Friction: To overcome this friction and get the object moving, you need to apply more force than you would on a smooth surface.

Think of it like this:

* Imagine pushing a box across a smooth, polished floor. It slides easily because there's little friction.

* Now imagine pushing the same box across a carpet. The carpet's fibers create much more friction, making it harder to move the box. You need to push harder to overcome that resistance.

Let me know if you'd like to learn more about friction!