Did you know? 

World Cup's ball ⚽🗺

I will talk about the soccer's ball.

There's some little rules of the ball:

 It must to be spherical.

It's made of leather or other suitable material. It circumference is not more than 70 cm and not less than 68 cm.

Its weight is not more than 450g not less than 410g.

Its pressure within equal to 0.6 - 1.1 atmosphere at sea level.

But, there's some science at soccer's ball? 

Yes!!!! There is a very interesting curiosity:

What happens to the ball moving faster?

The air resistance will increase if the speed of the ball increases. However, if the velocity of the ball is increased by exerting the critical speed, the drag force will behave very differently, depending on the velocity of the air.

Do you like this curiosity? 

So you have any curiosity? 

Talk to me.

Good bye 

Source: http://www.physics.hku.hk/~phys0607/lectures/chap05.html