Why is the wheel round and not square?

Because round wheels roll very easily.

Circular wheels can be rolling, this is only an appearance, and must grasp the essence of the circle, the circle to carry out a scientific and rational analysis, to find the direct cause of the wheel made of round. Take a straightedge to measure the distance from the center of the circle to the center of all points on the circle, they are all the same. This identical spacing is called the half warp. This is the main characteristic of a circle.

If the wheel is made into a ring, the drive shaft is installed in the center of the circle, when the wheel rolls on the ground, the drive shaft away from the ground spacing, has been equal to the wheel half warp then long. Thus, the box mounted on the drive shaft, the people sitting in the compartment, will be stable by the vehicle pulling.

If the wheels are square and the edges are high and low, in other words, the distance from the edge to the center of the wheel circle and the heart is not the same, then the vehicle will be walking, it must be head over heels.

The wheels made of round, naturally, there are other reasons, for example: when the same object rolling on the ground, than on the ground to support the go much more labor-saving, this is due to the rolling friction resistance than the sliding friction resistance is small reason. Sliding friction is the force of sliding friction caused when an object rolls along the surface of another object. Rolling friction is friction caused when an object rolls over another object. It is much smaller than the larger static friction and sliding friction, and in general, rolling friction is only 1/40 to 1/60th of the frictional resistance of sliding friction.

Therefore, rolling an object on the ground saves you a lot of energy compared to pushing the object to roll it. We design programs out of the wheel, is to better change the sliding friction for rolling friction, and the ring-shaped object is most conducive to rolling (ring-shaped object rolling in the center of gravity relative height relativity and the ground point of contact is the same as the rolling up without getting rid of gravity to do the work), and therefore the wheel has been the most respectable invention of the people.

The above is my detailed introduction, I hope to see you help. We have other opinions, you can discuss together in the message area below.