# Stuck in a question about frictions

• olesik
It is a type of bearing that is used to support a rotating shaft with a high load capacity and low friction. Bearing pressure is the amount of force per unit area that is exerted on the bearing surface. In summary, the conversation is about explaining various types of friction, including journal friction, bearing pressure, sliding friction, and rolling friction. Sliding friction occurs between two objects when they start moving against each other and can be reduced with lubrication. Rolling friction is the resistance to motion when a body rolls on a surface. A journal bearing is a type of bearing used to support a rotating shaft with high load capacity and low friction, and bearing pressure is the force per unit area exerted on the bearing surface.
olesik
Hello everybody,

I am doing ICS Btec Mech Eng course at the moment and I've stuck in a question about frictions.

So I have to explain journal friction, bearing pressure, sliding friction and rolling friction in relation to friction.

I've found following:

Sliding friction appears between two objects when they start moving against to each other. We can reduce friction between these object if apply some lubrication (usually we use oil)

The force resisting the motion when a body rolls on a surface is called the rolling resistance or rolling friction.

But what is a bearing preassure and journal friction? Does anybody can help with definitions please?

A journal bearing is another name for a plain bearing.

## 1. What is friction and how does it work?

Friction is a force that resists the motion of objects as they move past each other. It is caused by the microscopic roughness and irregularities on the surfaces of objects, which interact and create resistance when they come into contact.

## 2. What are the different types of friction?

There are four types of friction: static, sliding, rolling, and fluid. Static friction occurs when two objects are not moving relative to each other, sliding friction occurs when two objects are sliding past each other, rolling friction occurs when an object rolls over a surface, and fluid friction occurs when an object moves through a fluid, such as air or water.

## 3. How is friction measured?

Friction is measured using a unit called the coefficient of friction. This unit represents the ratio of the force required to move an object over a surface to the weight of the object. The higher the coefficient, the greater the friction between the objects.

## 4. What are some examples of friction in everyday life?

Friction is present in many everyday activities, such as walking, driving a car, and using a pencil. It is also responsible for the grip between our shoes and the ground, the friction between a car's tires and the road, and the friction between our hands and objects we are holding.

## 5. How can friction be reduced or increased?

Friction can be reduced by using lubricants, such as oil or grease, to create a layer between two surfaces. It can also be reduced by making surfaces smoother. On the other hand, friction can be increased by increasing the weight or force between two surfaces, or by making surfaces rougher.

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