# Static Friction – Definition, Formula, Examples

## Static Friction

Static friction is a force that hinders the movement of an object moving along the path. When two fabrics slide over each other, this friction occurs. There’s friction all around us. When we walk, for instance, our feet are in touch with the floor.

When we move, our feet’s backward motion exerts a pressure on the floor as the other foot progresses. Also, when we exercise this friction force on the floor, the floor on our feet exerts an equal and opposite strength. This is in line with one of the movement legislation.

If we want to avoid going on the steep floor, because of the presence of friction, we can do that.Â When we speak about friction, one thing to maintain in mind is that it will always behave in the reverse direction to that of relative motion, hence helping to slow down the velocity and eventually stop.

### Types of Static Friction

We can classify friction into several categories such as: dry friction, lubricated friction, the friction of liquid, inner friction, and friction of the skin.

#### Fluid Friction

Friction between the various parts or movies of a liquid is regarded as fluid friction. Usually, this sort of friction occurs between the parts of a viscous fluid or between two distinct viscous fluids.Â Â

#### Lubricant Friction

We understand that many devices use a sort of lubricant, generally oil, to decrease the wear and strain of the device components. The frictional force between this lubricant and any solid’s two surfaces is regarded as lubricated friction.Â

#### Skin Friction

There is a frictional force between the liquid and the solid surface when a liquid moves across the body of any solid. We refer to this sort of friction as skin friction. Frequently, we also refer to it as drag.

#### Internal Friction

It is not only between the internal layer that frictional force occurs but also among the components that form a material. The components that make up a foundation, for instance.

Friction arises between the elements when there is a change in the configuration of a substance or solid from its previous configuration in this case. In other words, when the body is subjected to what is called deformation, it occurs.Â Â

#### Dry Friction

When two strong substrates fall into touch, dry friction is the frictional force that enters into play. We can divide this form of friction into two broad classifications. These are: Kinetic friction and static friction are the two classifications.

#### Kinetic Friction

Kinetic friction is regarded as dry friction between two moving surfaces that slide or rub against each other. Also frequently referred to as sliding friction or dynamic friction is kinetic friction.Â  Now let’s look at another dry friction classification, which is static friction.

Static friction is the frictional force between two substances ‘ surfaces when they are not in movement. Therefore, in this case, the bodies are stationary in relation to each other instead of the bodies being in relative motion.

But ultimately the kinetic frictional force enters into play as quickly as the body begins to move. The force with which the two bodies grips each other and we depict it by a numerical quantity which we recognize as the friction coefficient.

The force that helps an object to remain on another object’s ground instead of moving down is regarded as the normal force.

### Solved Question for You

Ques: Which of these features has a soft surface?

1. Less frictional force
2. More frictional force
3. Sometimes less and sometimes more force
4. All of the above

Answer: A. Less frictional force

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