Why are wheels round, and why are wheels round and not square?

Why are wheels round? You may say that this is not an easy question, because round wheels are easy to roll!

The round wheel can roll drippingly, which is just a superficial phenomenon, and we must grasp the essence of the circle, conduct a scientific analysis of the circle, and find out the fundamental reason why the wheel is made into a circle.

What are the important properties of circles?

Let's start by looking at a circle drawn on the right. The outer circle is called the circumference, and the point where the compass is tied when the circle is drawn (now it is drawn as a black dot for easy seeing) is called the center of the circle. Let's take a ruler and measure the distance from any point in the circumference to the center of the circle, they are all equal.

This equal distance is called the radius. This is the importance of the circle.

If the wheel is made round and the axle is placed in the center of the circle, when the wheel rolls on the ground, the distance between the axle and the ground is always equal to the radius of the wheel. Therefore, the carriage mounted on the axle, and the people sitting in the carriage, will be smoothly pulled by the car. Suppose the wheel is broken, it is no longer round, and the rim is one piece higher and one piece lower, that is to say, the distance from the rim to the center of the wheel circle is not equal, then this kind of car must turn your head upside down.

Of course, there are other reasons why the wheels are round, for example: when something rolls on the ground, it is much less labor-saving than dragging on the ground, because the rolling friction resistance is smaller than the sliding friction resistance.

So, you must know why you use a compass when drawing circles. Because when the compass foot is opened, the distance between its feet is constant.

When did people come to know this property of the circle? Indeed, this was a long time ago. In the beginning, it was nature that inspired people to see how round the sun in the sky and the moon and a half moon were!

These objectively existing things give people the image of a circle. Gradually, the concept of a circle was born. People also began to learn to draw circles, but it was not easy to draw a very smooth circle.

After people knew that the distance from each point of the circle to a fixed point (circle center) was equal from production practice, they invented the compass to draw a circle.

The reason why the wheel is round is that it uses the principle of levers, and it is the most labor-saving structure to make a circle. If you make it into a different shape, it will be very difficult to ride.

But it's not all round, there are also square, don't believe it, look at the following **, but this kind of bike is not practical.

Resources.

Because the circle moves along the circumference of the figure, there is a point (the center of the circle) that moves horizontally and does not move up and down, so the wheel made of a circle will drip more smoothly

The wheels are round, which reduces friction when moving.

Because rolling friction is much smaller than sliding friction under the same conditions, and it is only in a circle that rolling friction can be generated... So...

Round -- one. Turn it around.

Two. Turn steadily.

Three. Can be turned continuously.

Four. The contact area per unit time is small and not easy to wear.

Five. To date, no other shape of tire has been found to be more effective than the round one.

Six. It is in line with the exercise physiology of the vast majority of people.

I've answered elsewhere, and I hope it enlightens you.

The wheels were originally square, and the more people rolled them, the more they were ground into the way you see them now.

Because of the low friction, it is easy to rotate.

For only the round ones can roll around on the ground.

Because the circle has an invariant radius.

The resistance of the circle is low and the run is fast.

Easy to roll with minimal force required to roll!

In fact, the wheels were originally square, and they accidentally made them round, and found that they were not bad to use.

It's round. If you want to be square, you can not walk a few meters in half a day.

If Fang can use it, that's fine.

Other shapes are inconvenient to turn.

Due to the round wheels it is very easy to roll.

The round wheel can roll drippingly, this is just a kind of appearance, and we must grasp the essence of the circle, carry out a scientific and reasonable analysis of the circle, and find the direct reason why the wheel is made into a circle. Take a ruler and measure the distance from the center of the circle to the center of the circle, and they are all the same. This same Bigao does the spacing, which is called the half-longitude.

This is the main property of circles.

If the wheels are made into rings, the drive shaft.

Installed at the center of the circle, when the wheel rolls on the ground, the distance between the propeller shaft and the ground is always equivalent to the length of the wheel warp. Therefore, the trunk installed on the propeller shaft, and the people sitting in the compartment, will be stably pulled by the vehicle.

If the wheels are square, and the edge is one higher and one lower, in other words, the distance from the edge to the center of the wheel and the center is not the same, then the vehicle must be dizzy when it walks.

When the wheel is round, there are naturally other reasons, such as: when an item rolls on the ground, it is much less labor-saving to regret than to walk on the ground, which is due to the fact that the rolling friction friction friction resistance is smaller than the sliding friction friction friction resistance. Sliding friction is the sliding friction caused by an object as it rolls along the surface of another object.

Rolling friction is the friction caused by an object when it rolls on another object. It comparatively has a large static friction force.

and sliding friction is much smaller, in general, rolling friction is only 1 40 to 1 60 of the friction resistance of sliding friction.

Therefore, rolling an object on the ground is much less strenuous than pushing an object to roll. We designed the wheel in order to better change the sliding friction to rolling friction, and the annular object is the most beneficial to rolling (the relative height of the center of gravity point in the rolling of the annular object is consistent with the contact with the ground point, and the rolling does not need to get rid of gravity to do work, so the wheel was once the most respectable invention of people.

The wheels are designed to be round mainly because of the effort saving and smoothness.

1. The distance from the center of the circle to any point on the circumference is equal, the distance equal to the lease crack is called the radius, when the wheel rolls on the ground, the distance between the axle and the ground is always equal to the radius of the wheel, so that the driving will be stable and closed, and there will be no bumps.

2. The round wheel can reduce the friction with the ground in the process of driving, improve the acceleration, and improve the work efficiency of the car.

3. If the wheel hub of the car is deformed due to some fault reasons, and the impulse distance from the tire to the central shaft is not equal, the car will not be stable in the process of driving.

It is because if you choose a square, it is not convenient to drive at all, and there will be great difficulties in the process of driving, and the round one is convenient for rolling.

Because the round wheels are more conducive to the wheels to walk and can avoid bumps, the wheels are set to be round.

Because the circle can be rolled, it can reduce a lot of friction, and it is more convenient when walking.

This is because the round wheels are able to roll and keep the vehicle running.

Circles have the property that the distance from the center of the circle to any point in the circumference of the circle is equal, and this equal distance is called the radius. That is to say:

In the same circle, all the radii are equal. "So, people made the wheel round and made the axle pass through the center of the circle, and when the wheel rolled on the ground, the distance from the ground was always equal to the radius of the wheel. If the wheel is deformed, not round, and the distance from the rim to the center of the wheel is not equal, then this kind of car will definitely bump up and down, how can it move better?

Of course, the wheels are made round because the rolling friction is smaller than the sliding friction.

There are two main reasons why the wheels used in cars are designed to be round, one is labor-saving, and the other is stability.

Since the wheels are designed to be round, frictional resistance can be reduced during driving, and the axles roll on the ground through the center of the circle, resulting in a smoother ride. The wheels are rounded and the axles are mounted on the center of the circle. When the wheels of the car turn, the distance between the axle and the ground is always equal to the radius of the wheel, so that the driving will be smoother because the carriage is mounted on the axle of the car, and the carriage will be more stable only if the wheels run smoothly.

Round wheels can reduce friction with the ground, improve acceleration, and improve the efficiency of the car at the same time. If the wheel hub of the car is deformed due to some fault, and the distance between the tires and the central axis is not equal, the car will be unstable during driving. It is worth mentioning that the center of the circle is called the center of the circle, and the distance from any point on the circle to the center of the circle is equal.

When the wheels are in motion, the radius of the wheels is always equal, so the car will run more smoothly, which is why the wheels are designed to be round.

Precautions for the use of car tires

1. Tire positioning, in the process of driving the car, if you find that the tire is eccentric or the vehicle is over-shaken, please detect the tire positioning in time. If not solved in time, it will affect the handling of the vehicle, and in serious cases, it will also be dangerous.

2. Check the tire pressure of the car frequently, the tire pressure directly affects the use of the tire, and the tire pressure is too low to increase the friction between the ground and the tire, resulting in accelerated tire wear. Therefore, it is advisable for car owners to check their tire pressure once a month, and the tire pressure value should be based on the parameters recommended by the vehicle manufacturer.

3. When the tire is worn to the wear indication to stop using, it is generally designed at the position of about millimeters of the remaining depth of the tire groove, and the tire is worn to this sign when it must be replaced. Because tires that exceed the wear indication sign are dangerous when driving in wetlands, due to their greatly reduced drainage, which seriously affects wet grip.