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In fact, the so-called sole slip is not sliding, which means that the friction between the sole and the road is not big. We know that the friction between two contacting objects depends on three factors: the friction coefficient k on the surface of the object, the contact area s between the objects, and the pressure f applied to the object. The larger these three variables, the greater the friction.
Corresponding to a mountain friend who bought shoes, the weight of the mountain friend is basically determined, then the pressure on the road when it has been determined, and f becomes a constant. The friction coefficient here depends mainly on two factors, one is the road surface and the other is the sole, because we mainly look at the slippage of different soles on certain roads, so we treat the road as a constant treatment here. , so the friction coefficient mainly depends on the friction coefficient of the sole; many mountain friends believe that v bottom shoes are relatively slippery, here I do not make conclusion first, but the friction coefficient of v rubber certainly is not smaller than the rubber of other soles, because we know In most brands of climbing shoe soles are used v rubber. In the rock climbing, the friction of the sole is the most stringent.
Now let's look at the last parameter that affects friction, the contact area. In most practical situations, this indicator is the one that most influences us on different roads. As we all know, the soles of climbing shoes are made with various patterns, and these patterns are used to increase the friction between the shoes and the ground (which is often referred to as the “grasping sensationâ€), but why can we increase the pattern? Big shoes and ground friction? The conclusion is that the pattern can effectively increase the contact area between shoes and road surface under outdoor conditions. The reason why the outdoor conditions are mentioned is mainly because we are on the journey of climbing and crossing. The main roads for walking are gravel, earth, lawn, snow and so on. On these road surfaces, the raised pattern of the sole can penetrate deep into the soft road surface, so that the vertical portion of the raised pattern also becomes a part contacting with the ground, which doubles the contact area between the sole and the ground, thereby greatly increasing the Friction. In non-outdoor conditions, the situation is just the opposite. For example, when we walk on the street and even on the tiled floor, the ground surface is very hard. The pattern of the sole cannot penetrate into the road surface, and the contact area between the shoe and the ground becomes smaller. (Only the lower surface of the protruding portion of the pattern), the friction force is significantly reduced. At this time, we still do not feel too slippery, mainly the rubber friction coefficient of the climbing soles is relatively large. If you don’t believe this, you can use a pair of shoes that have been worn for a long time and whose sole pattern has been almost flattened. It is certain that the anti-slip performance is better than the new hiking shoes.
In addition to the patterns affecting the contact area, there is a case that is often overlooked by everyone: the effect of sole deformation caused by different degrees of softness and hardness of the sole. In the soft road surface, because the deformation of the road surface is the main, it is not easy to see the effect of the sole deformation, and on the hard road surface, the effect of the deformation of the sole is significantly increased. For softer soles, there will be some sinking of the sole pattern on hard surfaces (both protruding parts are compressed, shorter and thicker) and a rough surface that adapts to the very fine ground of the road surface (actually on a smooth surface is also rough with a magnifying glass It is uneven, and some subtle deformations of the sole can make the sole rubber buckle into these uneven bottoms). This can also increase some of the contact area to increase the friction; but for relatively hard soles, such deformation is very small, so the shoes with softer soles on hard surfaces must have stronger friction than shoes with harder soles.
According to the above conclusion, if we only consider the anti-skid performance of the hiking shoes, then this pair of hiking shoes should be such a sole: the sole rubber has a large coefficient of friction, a deep sole pattern, and a soft sole. There is no objection to the first two requirements, but for the last point, I think all people do not agree. The soft soles means that the soles are not well worn and not worn for a long time. At the same time, the soles are not suitable for the crushed stone that we often walk on. This is where the contradiction lies. If friction is to be great under all circumstances, then the sole must be soft; if it is desired that the shoe be frictional in most cases and at the same time meet the durability, the protection of the foot must be hard. Under the current technical conditions, there is no degree of softness and hardness of the outer surface of the sole. Therefore, no shoe can meet the two contradictory needs above. In this regard, manufacturers of soles can only make some trade-offs after some trade-offs.
v The sole is obviously the latter, so many of them react on a slippery, hard, flat surface, and v shoes are slippery. In the case of a wet slippery bottom, the friction coefficient between the sole and the road surface is significantly reduced, while the hard bottom surface is in contact with the hard bottom, and the contact area is also small. So the slip is certain. On such a road surface, a pair of thoroughly flat-bottomed rubber shoes is relatively non-slip.
After the above discussion, I think we should have a clear understanding of buying shoes. Whether you want to buy harder shoes or softer shoes depends on the road you often walk on. For mountaineering and difficult crossings, a pair of hiking shoes with hard soles can do most of the things. For ordinary travel, it is better to buy a pair of ordinary shoes with relatively softer soles. We are not superstitious about the end of v, and we should not negate v at the end because v is slippery in individual situations.
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It is often seen that some mountain friends are discussing the problem of slip resistance of some soles. I would like to discuss with you from the perspective of physics theory.