# What is the relationship between surface roughness and friction?

## What is the relationship between surface roughness and friction?

Irregularities present on a surface are often described as surface roughness or texture. These surface textures such as grooves and dimples impart friction, which is the force between two sliding objects. Therefore, there is a relationship between surface roughness and friction.

## Does friction depend on the roughness of the surface?

Generally, the magnitude of the force of friction depends on the roughness of the material. The rougher or bumpier the material, the more friction there will be. As the strength of the normal force increases (which is the force between the “sliding” surfaces) the strength or magnitude of the friction also increases.

Why does the roughness influence the force of friction?

Explanation: Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

### What is caused due to roughness of two surfaces in contact and trying to move?

Friction is due to the presence of irregularity or roughness on a surface.

### How does the roughness affect the motion of an object class 8?

The nature of the surface (smoothness or roughness) affects the friction. Smooth surfaces have lesser irregularities. The more the tendency to lock, the more the friction (that is tendency to oppose motion). And so, a ball rolls slowly and covers a lesser distance on a rough surface such as muddy play ground.

Why does smoothness affect friction?

However, friction decreases with smoothness only to a degree; friction actually increases between two extremely smooth surfaces because of increased attractive electrostatic forces between their atoms.

#### How can you say that friction is caused due to roughness of surface?

Friction is caused by the interlocking of these irregularities in the surfaces of two interacting bodies. For a smoother or relative motion, these imperfections must be overcome. Roughness of the surface increases when these imperfections increase. Thus, friction increases with increase in roughness.

#### How is friction related to the smoothness of a surface Class 8?

Rougher surfaces have more friction between them than smoother surfaces. Heavier objects press together with greater force, and this causes greater friction between them.