Is it better to run or walk in the rain why

。Friend.. If it's the same distance and there is no wind (conditions are important).。。

It must be less run. Because the rain you are showering is made up of two parts. Part of it falls directly above (head and shoulders), part of it hits you due to relative motion, and no matter how fast or slow you run——— the raindrops that hit you head-on are always the same!!

Focus!!! To explain this, suppose you are a whiteboard eraser, as shown in the picture, there is a whiteboard covered with black, leaving two traces, the first is that the whiteboard does not move and you wipe it, and the second is left by falling down, you will find that the area corresponding to the two prints is the same, that is, the amount of black ink you stain is the same.

Expand on it, if the black ink is rain and the eraser is you, then the first one is equivalent to the raindrops stopping in the air and you walk past, and the second one is equivalent to the raindrops falling at a certain speed as you walk by, and the rain on the front is the same.

Now the key is that the first one can actually be seen as you walking at a very fast speed, and the raindrops didn't even move at that moment, and the second one is equivalent to you walking at a slightly slower pace, and the raindrops fell for a certain distance, and the rain was the same on both fronts!!

The rain on the front has nothing to do with speed!! Then the rain you are drenched in is only related to the rain on your head, do you say that you are drenched more or run more... Pure hand-made original, I hope it can help you.

I think it depends on the situation, if it is a thunderstorm in the wilderness or flat land is not suitable for running or walking, it is best to find a low-lying place to squat or lie down, with your feet together as much as possible. In other cases, try to find shelter from nearby buildings and wait until the rain is light before setting off. The vision is not good in rainy days, and the vision is even worse when people are in the rain, and it is easy to have accidents when running quickly, so safety is the top priority.

The road surface is slippery at the beginning of the rain.

When driving in the rain, don't go too fast, especially on the highway. On the one hand, the braking distance is greatly extended, and if the speed is too fast, it is almost impossible to ensure driving safety; On the other hand, when braking at high speed in rainy days, it is very easy to skidding and tail flicking, causing the vehicle to lose control. Do not apply emergency braking while driving, especially pay attention to the first few minutes of rain is the most dangerous, at this time you should reduce your speed and do not brake suddenly.

Precautions for driving in rainy weather.

When passing through intersections and curves in rainy days, slow down, honk, pay close attention to the dynamic situation of the road, and slow down, give way, and stop first when encountering the situation, and it is strictly forbidden to rush to the road.

Pay attention to the movement of vehicles and pedestrians, and beware of pedestrians and vehicles riding with umbrellas, raincoats, and ponchos that affect their vision.

In case of continuous heavy rain and flash floods, rivers rise sharply, floods, floods, floods, etc., drivers should be especially cautious and observant. When the situation is unclear, you should choose a safe place to park and contact the local traffic management department or unit in time.

When it rains, can I run to save myself from the rain?

China Digital Science and Technology Museum Collection(105) |Reading (25394).

First of all, it is a common misconception that whether it is the same time or the same distance, it is not necessarily that the faster you run, the less rain you will get. The most intuitive way to understand this is the Galilean transformation, which uses the runner as a frame of reference.

So, if people are still in the rain, how can they get the least rain? Obviously, it is the case of raindrops falling vertically, because only the top of the person's head (and shoulders) will be drenched in the rain, not on the sides. Of course, it is reasonable to assume that the human form is much larger in the side area than the top of the head.

Converted back to the ground frame of reference, the case where the raindrops fall vertically is under the ground frame of reference, which is the situation where the speed of the runner coincides with the horizontal component of the speed of the raindrops. Therefore, if the rain time is the same, the rain is the least when the runner's speed coincides with the horizontal component of the rain speed.

Let's talk about the same distance that runners have covered.

Let's consider a limit case: a person is as slender as chopsticks (the top of the head is much smaller than the side area). Then, according to the previous narrative, no matter how long the person is in the rain, as long as his speed is consistent with the horizontal rain speed, he will not get wet for a limited time; Movement faster or slower than this will get wet.

Therefore, if and only if he runs a certain distance at this speed, the amount of rain is minimal (zero).

From this limit, it can be seen that when the distance covered is the same, it is not necessarily that the faster you run, the smaller the rainfall; The optimal solution depends on his physical form, the distance he has run, his running speed, and the speed of the rain.

Specifically, the intervals that make this assertion valid are that the body is more elongated, the distance traveled is shorter, and the direction in which the rain falls is more slanted. Qualitatively, the final amount of rain depends on the time and area, with elongated forms and running at a speed close to horizontal decreasing the area, and shorter distances and faster running speeds reducing the duration of rainfall.

Walking in the rain.

Let's think about it first, what are the benefits of running? If you can reach the goal early, the rain time is short, so the amount of rain is less. What about walking? The cross-sectional area of rain will be small, so the amount of rain will be small. But it will take more time to walk. It doesn't necessarily mean that the amount of rain is less.

It can be seen that there is a premise to be asked here, and the question should be asked like this: When it rains, from A to B, is it less rain when running or less rain when walking?

I still have to think about it to make it clear.

How do you calculate the amount of rain that falls on your body? When you stand, the rain above your head will fall on your body, and when you run, the rain in front of you will also fall on your body. It seems that it is difficult to calculate.

There's a trick. Imagine that the rain in the sky is stationary, that is, the space is evenly distributed with water droplets. Man can be simplified into a cuboid with a height of H (height), width of W (shoulder width), and thickness of L (chest thickness).

The movement of people in the rain is equivalent to making an oblique hole in the space of water droplets, and the oblique angle is the ratio of the rain velocity VR to the human movement speed VP. The horizontal direction of this diagonal hole is a fixed value s, and the vertical length is the speed of rain falling multiplied by the time it takes for people to pass. Both vr*s vp

You have to think about the cross-sectional area of the hole, which is the cross-sectional area in the vertical direction. This is important. This cross-section is the vertical component of the front area of the person plus the top area, that is, h*w + w*l (v rain v man).

The volume of this hole is the amount of rain that people are showered with. That is, the vertical cross-sectional area of the hole multiplied by the horizontal distance s

Rainfall volume = s*h*w + s*w*l*( v rain v person).

Here only (v person) is a variable, it can be seen that the slower the person's speed, the more rain will be showered, but no matter how fast the person runs, the rain volume will be at least s*h*w

When the speed of people is much greater than the speed of rain, the amount of rain does not increase much, but when the speed of people is much smaller than the speed of rain, the amount of rain will increase much.

When the rain is light, that is, s*h*w is not enough to drench people, then running can reduce the amount of rain. But if the rain is so heavy that s*h*w can drench people, then the effect of a little more rain is still soaked, and no matter how fast you run, it will be soaked. It doesn't make sense to run or not.

It can be seen that the rain is light, and if the distance is not far, you can consider running back. If it's raining heavily, let's take shelter. No matter how you run, you can't escape a soaking wet.

Use extreme assumptions:

If a person runs at the speed of light. Then the rain that pours on the body is the rain that the human body hits.

If a person walks at the same speed as a snail. Then the water that pours on the body ......So in some cases, the faster you run, the least amount of rain you get.

Of course, this is not a linear process. The case in the middle requires more detailed calculations.

According to scientific estimates, when it rains, people are less exposed to rain than when they run.

In fact, most of them have experienced that it rains less when they run than they do when they walk.

Obviously, there is a concept of time here:

1. The above problems should be counted at the same time, and there is less rain when it rains when walking and running;

Second, if it is the same distance of rain, there is a time problem of walking and running, of course, the longer the rain, the more rain.

So we still have to ignore the above problems, and we still have to run when it rains heavily.

Probably not!

Considering two aspects, for the rain directly ahead, it has nothing to do with the speed, no matter how fast you go, it will rain all the rain in a volume. (Even though the rain will fall, but the same amount of rain is added in front of you, then you can see that the rain is suspended in the air, so the amount of rain you are showering is proportional to the volume of space you brush (the density of raindrops is constant)). And for the rain directly above, it is only proportional to your rain time, you are in any position, there is so much rain on you per unit time, so, to reduce the rain above, you must shorten the exposure time, then, the faster, the faster you reach the destination, the less time consumed, the more you can reduce the rain above.

But if you don't have an umbrella and walk a long distance, you need to calculate whether the amount of rain you can reduce by running hard is worth it, and in the case of long distances, it doesn't matter if you run or not when the fixed amount of rain in front of you is enough to make you soak.

It's the same, it's just the length of time.

It's basically about the same, if it rains heavily, it will drench.

In the same way, wouldn't it rain before running? It's just a matter of how much to shower.

When it's raining, it's raining, and I've done experiments with a distance of 200 meters, and if you walk at a normal speed, the whole body is headed. Back. The legs were basically soaked, it took 144 seconds, and the weight of the water was 108g after straining hard in the basin.

But when running, it takes 28 seconds, only the front chest is very wet, and the weight of the water is 23g, the result: running is less rain than walking, but it will be concentrated with the front, which is reflected in the less time it takes to run, the body is exposed to the rain less, and the weight of water is light, so on a rainy day, the rain is different from running.

It is not the same within the specified distance.

In the case of equal and balanced rain, running is more drenched, and if the rain is uncertain, then it is distributed according to the size of the rain. Of course, the distance mentioned upstairs is also a problem. But if you run or walk around the house when it's raining, you won't get drenched at all.

The reason is simple: you can do a simple experiment. When you move quickly, you use your body to impact the rain in front of you, and the rain in front of you should be a wall of water.

And when you walk, it's a wall of water, but by the time your slow movement arrives, the rain is already falling on the ground. Of course, when you run, the front body is drenched, but the back is drenched less.

The above is purely a personal opinion, and the little experience I have learned when I ran in the rain in the past is correct or not, and it needs to be verified.

There are many people who say this.

So it must be more rain than when it is still

Normal people, generally without rain gear, do you choose to run back or walk back?

Because of the fast running, there is a lot of rain per unit of time.