Why is the wheel fitted with ball bearing reduces friction?

In the historical development of mankind for thousands of years, the ancients left many world-famous buildings, including the Great Wall of China, the pyramids of Egypt, and so on. Looking at these buildings, we can't help but marvel at how skilled our ancestors are. These ancient buildings were built by their ingenuity. However, in the face of these magnificent buildings, we could not help but have a problem: far from a few hundred years ago, there was no machinery, and what methods did our ancestors use to transport the heavy stones and wood needed to build buildings? Why is the wheel fitted with ball bearing reduces friction?

Why is the wheel fitted with ball bearing reduces friction--It turns out that the methods used by our ancestors can still be seen today: when carrying things, put a few ball bearing reduces friction.This is because when the object slides on the ground, there is a sliding frictional resistance where it comes into contact with the ground; and when the object rolls on the ground, the resistance is the rolling frictional resistance. In general, the rolling frictional resistance is only one-fortieth to one-sixth of the sliding frictional resistance, so ball bearing reduces friction.

Why is the wheel fitted with ball bearing reduces friction--by t

he same token, there is no car with a ball bearing, the friction between the bearing and the journal of the wheel is also sliding friction, and the resistance is relatively large. Such a bearing is not only easy to wear, but also the car does not run fast. The wheel of the ball bearing is mounted. When the car is started, the axle of the wheel rolls on the ball, and the ball bearing reduces friction. As a result, the sliding friction is turned into rolling friction, and t ball bearing reduces friction. Therefore, the car has become light and labor-saving.

Why is the wheel fitted with ball bearing reduces friction--there is such a phenomenon in daily life, and our trolleys will be lighter if they are loaded with ball bearings. This actually implies a very simple physical principle. We know the rolling frictional resistance, which is only one-fortieth to one-sixth of the sliding frictional resistance. For a car without a ball bearing, the friction between the bearing and the journal of the wheel is sliding friction, and the resistance is relatively large. Such a bearing is not only easy to wear, but also the car does not run fast. The wheel of the ball bearing is mounted. When the car is started, the axle of the wheel rolls on the ball, and ball bearing reduces friction. As a result, ball bearing reduces friction, and the resistance is greatly reduced. .

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