How about things in life, lubricating oil rollers reduce friction?

What is the principle by which lubricating oil is added to the rotating part to reduce friction?

Friction is reduced by reducing the coefficient of friction of the contact surface.

Lubricating oil to reduce friction What is the method used.

To make the surface smoother, the answer supplement is to reduce the roughness of the surface, and adding lubricating oil can balance the potholes on the surface of the object.

A junior high school physics common sense I don't know how to reduce friction by adding lubricating oil to the rotating part of the machine.

The function of lubricating oil is to form a protective film between the two friction pairs to avoid direct contact between metals, so as to buffer the friction effect.

Lubricating oil reduces friction by separating the contact surfaces from each other, why.

If you sprinkle sand, the sand separates the box from the cement floor, the friction coefficient decreases, and the friction force decreases, so you pull it.

Why lubricating oil reduces friction.

How to reduce friction by adding lubricating oil to tires?

The contact surfaces are separated from each other to reduce friction.

In what way does lubricating a relatively sliding shaft reduce friction?

Features as the name suggests:1Anti-wear agent 2Extreme pressure anti-wear agent 3Oily agent The oil film adheres to the metal surface and is not originally rough.

Lubricating oil is added to reduce friction by separating the contact surfaces from each other.

In general, there are several ways to reduce friction: reduce the pressure between objects, reduce the roughness of the contact surface, and separate the contact surface.

Adding lubricating oil to reduce friction is done by changing the roughness of the contact surface or by separating the contact surface.

There are four specific ways to reduce the roughness of the contact surface, and separating the contact surface is just one of the answers to your question Generally fill in Yes.

Is adding lubricating oil to make the contact surface smooth and reduce friction?

Specifically, it should be to reduce friction. Because if lubricating oil is applied between two objects, the lubricating oil will form an oil film on the friction side, that is, .

The viscosity of the lubricant also affects the friction.

Lubricating oil can make up for some uneven parts of the contact surface, so that the contact surface is disengaged, thus decreasingFriction

Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and mechanical equipment to reduce friction and protect machinery and processed parts, mainly for lubrication, collapse and hail auxiliary cooling, rust prevention, cleaning, sealing and buffering (ROAB).

As long as it is applied to two relative motions.

The function of reducing the friction and grip wear caused by the contact between the two objects, the sail is the lubricating oil.

The meaning of lubricating oil

Lubricating oil and grease are a kind of lubricant. The so-called lubricant, simply put, is between two objects in relative motion, which has the function of reducing the friction caused by the contact between two objects.

Lubricants are a technology-intensive product and are complex hydrocarbons.

The real performance of the mixture is the combined effect of complex physical or chemical change processes. The basic properties of lubricating oil include general physical and chemical properties, special physical and chemical properties and simulated bench tests.

Each type of grease has its common general physicochemical properties to indicate the intrinsic quality of the product.

Static friction: When two objects in contact with each other have a tendency to slide relative to each other, but remain relatively stationary, they act on each other to hinder the resistance of relative sliding, which is called static sliding friction, referred to as static friction.

Sliding friction: When objects that are in contact with each other (and squeezing each other) have relative sliding between each other, the friction that arises between objects is called sliding friction (or "friction that occurs when an object slides on the surface of another object"). Note that sliding friction is not kinetic friction!

Rolling friction: When an object rolls without sliding or has a tendency to roll on the surface of another object, the obstruction effect on rolling due to the deformation of two objects under pressure in the contact part is called "rolling friction". Its essence is static friction.

The difference between static friction, sliding friction, and rolling friction is the reason for their occurrence, the direction and magnitude of the force, and the specific details are as follows

1. The causes are different: sliding friction is the friction generated when an object slides along the surface of another object. Static friction is the frictional force caused by an object having a tendency to move on the surface of another object (when in fact the object is still at rest).

Rolling friction is the friction that occurs when an object rolls on another object.

2. The direction of the force is different: the direction of the sliding friction force is opposite to the relative direction of the object; The direction of the static friction force is opposite to the direction of the object's relative motion trend; The rolling friction is in the opposite direction to the rolling direction.

3. The magnitude of the force is different: the maximum static friction is greater than the sliding friction, and the rolling friction is much smaller than the maximum static friction and sliding friction.

Ways to increase beneficial friction.

1. Increase the roughness of the contact surface;

2. Increase pressure;

3. Turn rolling friction into sliding friction.

Ways to reduce harmful friction.

1. Replace sliding friction with rolling friction;

2. Separate the contact surface [form a layer of air cushion or magnetic levitation on the contact surface of the object];

3. Reduce pressure;

4. Reduce the roughness of the contact surface of the object.

Examples of friction in life.

Sliding friction: In life, the conveyor belt sends the goods from the low to the high place, which is achieved by the friction of the conveyor belt on the goods obliquely.

Rolling friction: The friction of the train's driving wheels is the driving force that pushes the train forward. The static friction of the driven wheels is the rolling friction that hinders the progress of the train.

Their production mechanism and effect are different.

When an object (such as a wheel) rolls without sliding on the surface of another object (pure rolling), the obstruction effect on rolling due to the deformation of two objects under pressure in the contact part is called "rolling friction". Rolling friction is generally measured in terms of drag moments, and the magnitude of the force is related to the nature of the object, the shape of the surface, and the weight of the rolling object. Rolling friction is actually a moment that hinders rolling.

When an object rolls on a non-smooth plane, its motion will gradually slow down until it comes to rest if it is no longer subjected to force or moment. This process is due to the deformation of the contact between the object and the plane, the object is trapped in the supporting surface by gravity, and the object itself is also deformed by compression, when the object rolls forward, the supporting surface in front of the contact is raised, so the elastic force of the object does not point to the axis and moves forward. It is this elastic force that creates a reaction moment that hinders the rolling of the object, which is the rolling friction.

When an object rolls, the contact surface is constantly changing, and the "rolling friction" on the object is subjected to.

Essentially, it is static friction.

The softer the contact surface, the greater the shape change, the greater the reaction moment, and the greater the rolling friction.

Rolling friction and sliding friction.

The formula for calculating the magnitude of sliding friction is f = n, and the dynamic friction factor in the formula is also called the sliding friction coefficient, which is only related to the roughness of the material and the contact surface, and has nothing to do with the contact area; n is positive pressure.

Sliding friction: A force that occurs between two objects that are in contact with each other and slide relative to each other, hindering the relative sliding between them.

The direction of friction is opposite to the direction of the relative motion of the object or the direction of the relative trend of motion. and not in the opposite direction of motion of the object. Friction can be used as a driving force as well as a drag force.

1. Lubricating oil can play a certain role in lubrication.

2. Change sliding to rolling, such as adding round rolling wood under heavy objects, adding round steel balls in the shaft, sprinkling sand on the contact surface, etc.

3. Choose materials that are in contact with light. Ice, steel, etc.

Ways to reduce friction: reduce the roughness of the rough surface; Reduced pressure; Change sliding to scrolling; Slightly separate the contact surfaces of the object.

What are the causes of friction, in fact, there are many studies on the causes of friction, and the following reasons are generally recognized. The first is the microscopic unevenness between the surfaces of two objects in contact with each other. This is actually quite easy to understand, that is, as long as the two surfaces that we see seem to be very flat are placed large enough, we will find that the "flat" surface is actually uneven, there will be a lot of unevenness, when the two surfaces have a tendency to move with each other under a certain pressure, the unevenness between the two surfaces will block each other, just like we are walking on the gravel road and are easy to trip over stones.

The unevenness between the surfaces can also have a hindering effect on the movement, which is what we usually call friction. The second explanation of friction is the interaction between molecules and atoms. The object will be deformed after being stressed, and the molecules and atoms will be very close to each other, and after the contact of two different surfaces, there will inevitably be some molecular atoms that are very close to each other, so close that the intermolecular forces will have an effect, and the interaction between these molecules will sometimes hinder the progress of the movement, which is what we call friction.

The above two explanations are common and most accepted explanations of the causes of friction. Generally speaking, when the flatness of the contact surface is low, the first cause of friction is the main one. When the surface flatness is very high, the friction caused by the second cause is the main one.

Usually, the surface roughness of machined parts is far from the extent that the second reason has a major effect, so in order to reduce friction, we still have to find ways to reduce the surface roughness between the contact surfaces. The fluidity of the lubricating oil can fill the unevenness between the contact surfaces through free flow, reduce the unevenness between the contact surfaces, and thus reduce friction.

When we continue to add lubricating oil, when there is enough lubricating oil to separate the two contact surfaces, at this time the ordinary friction has become liquid lubrication, and the friction properties have changed due to the fluidity of the lubricating oil. The friction has changed from mixed friction to liquid friction, and the fluidity of the liquid can greatly reduce friction.

(1) Static friction: When there is a relative sliding tendency between objects that are in contact with each other (and squeezed by each other), the friction generated between objects is called static friction. (or "There is a tendency for objects to move relative to each other, but there is no friction in relative motion".)

For example, a block that is stationary on an inclined plane is subject to the static friction given by the inclined plane.

2) Sliding friction: When there is relative sliding between objects that are in contact with each other (and squeezing each other), the friction generated between the objects is called sliding friction. (or "the friction that arises when an object slides on the surface of another object.")

For example, a block moving on a horizontal plane is subject to the sliding friction given by the horizontal plane.

3) Rolling friction: The friction generated when a "wheel-shaped or spherical object" rolls on the surface of another object is called rolling friction. For example, if a car is moving at a constant speed on a level road, the friction on the wheels is called rolling friction.

The pulling force is f, the object gravity is g, and the pulley gravity is g', the friction force f of the movable pulley

According to the two-force equilibrium, the upward force is equal to the downward force, 2(f+f)=g+g', giving f=1 2(g+g')

Rolling friction and sliding friction.

Friction in general seems to be negligible in the calculation, but if it is to be included in the topic, it should be specially explained.