Physics for IGCSE & O level - Forces And Motion (Section 11 - No. 38)
How does the surface of an object affect friction?
The rougher the surface, the less the friction.
The smoother the surface, the greater the friction.
The roughness of the surface does not affect friction.
The rougher the surface, the greater the friction.
Vysvetlenie
Rougher surfaces generally create more friction.