Why is a football a circle of 30 and why is a football round

The landlord is so cute, it's like you ask why are the wheels round? Why are ancient copper coins round? Just as cute.

First of all, the landlord: In geometry, the football is not round, it should be a sphere. The circle you are talking about is just looking at the problem in a two-dimensional plane.

It is important to remember that there is no absolute thing in the world at the moment, just like football, there is no absolute sphere. The landlord should have studied chemistry, there is a famous saying in it: there is no absolute purity in the world (that is, all objects are impurities).

Here's a truth. So don't ask such questions in the future, it's as hard as asking why the sun looks round.

The circumference of the soccer ball used in the official game is 27 inches (68 centimeters) to 28 inches (70 centimeters), the weight of the ball at the beginning of the game is 14 (410 grams) to 16 ounces (450 grams), and the air pressure of the ball is 0.6 to 1 1 ounce per square centimeter, which is 600 to 1,100 grams per square centimeter.

The surface of the match ball must have one of the three signs, including "FIFA approved qualified", "FIFA inspection qualified", "international competition ball standard" certificate, with these marks is equivalent to officially passing the inspection, in line with various technical specifications; Except for the badge of the contest and the organizer and the trademark of the authorized manufacturer, there may be no commercial advertising.

The round ones are easy to roll around on the field, and they are smooth and enjoyable.

Because there is no deviation of the angle of the circle.

Take a dumbbell and you kick it.

The earth is round. People think that the circle is the best.

Because every point on the surface of a soccer ball has the same physical properties. In other words, any point that any athlete touches in any position and with any part is the same, and people have the most control over it, and can best show the charm of people. Moreover, the spherical shape can ensure the speed and stability of the movement, improve the fluency, and have more ornamental value.

It is easy to roll on the course. Enables players to have better control of the ball.

Not all soccer balls are round.

Because if it is not round, it will change direction when it lands.

It looks like the balls are all round.

Only the round ones can roll up.

It's good to control the ball, how to kick the ball when it's square?

Soccer balls are round for the main reasons: they reduce pain, roll faster, and have a controllable flight trajectory. The circle is the most perfect shape, and the football, as a sphere, is basically free of edges and corners.

The ball rolls faster and can maintain a longer motion state after being stressed, which is suitable for operation. On the football field, there are many ways to kick free kicks. You can pull out a perfect arc with the inside instep.

As we all know, motion creates friction, and if a force is applied to an object to make it move on the surface of another object, the friction generated will hinder its motion. The soccer ball is a sphere, and the motion of the sphere produces rolling friction; For other shapes, sliding friction is often generated.

From life experience, we know that scrolling is always less effort than sliding. Therefore, the spherical object will maintain a fast speed and maintain a long time of motion during the forced rolling process.

The ball is round, symbolizing a cycle, illustrating that there are no absolutes and that in football, any second can change the outcome.