Why is it so difficult to swatt flies with your hands, but easy to swatt with a fly swatter?

Swatting flies by hand, it is difficult for people to achieve the extreme speed. Because when people are afraid of flies, they are afraid that once the speed is too fast, then the end result is to slap on the object, causing palm pain. Therefore, many times, we don't subconsciously shoot flies too fast, let alone slow down when approaching flies.

Therefore, flies can often escape at this time. Another way is to catch flies with bare hands, generally the palm of the hand is slightly hooked, along the front of the fly's head, and the fierce super fly catches. At this time, because the hand is not afraid of objects, we will not subconsciously slow down, but try to be as fast as possible, so it is easy to catch flies.

I'm sure many people have caught flies like this.

A compound eye of a fly has at least more than 4,000 small eyes, and there is a compound eye on the left and right sides of the fly, and these two compound eyes are like super sensitive external receptors, even if you raise your hand to the position, speed and flow of air, the fly will fly away. Flies also have three monoceles, which are composed of visual cells and corneas, and can only sense the intensity of light, but cannot see objects.

Just imagine, 2 compound eyes are scanning in all directions, and its imaging speed is much faster than ours, just like radar, as long as there is wind and grass, the compound eye of the fly will be immediately felt, you attack from behind, the compound eye can also be seen. Therefore, you can only improve your speed, and it makes perfect sense that the world's martial arts are only fast and not broken. If you try to increase the speed of your hand slap without fear of pain, then you will increase the success rate of swatting dead flies by 50%.

The second is that flies escape by constructing strange visual organs. The flies have a very special eye, there are five of them. Three of the smaller ones are monocular, which perceives the brightness of light, and the other two are compound eyes, each consisting of a number of hexagonal visual units.

These many eyelets are self-contained, with independent optical systems and nerves to the brain, and the optic nerves of these eyelets can cooperate with each other, which can be coordinated and divided independently. Therefore, the fly's eye not only has the ability to distinguish speed and height, but also can perceive the vision from different directions, which is why when people swatt it with a fly, it will sometimes be found and run away. This compound eye has a high temporal resolution:

It can divide moving objects into a coherent single visual image, so that they can escape in time when attacked.

Because the eyes of the flies are compound eyes, when the hand is not close, the compound eyes of the fly have already detected the arrival of the hand, so they can avoid it in time;

However, the fly swatter has many holes, and although the compound eye of the fly can find a few holes, it cannot find all the holes, so the fly thinks it can avoid all the holes, but it just falls under the other holes, so the fly swatter can be large enough for a fly.

Without small holes, flies can escape based on changes in temperature, humidity, and flow of air. Therefore, the reason why the fly swatter can hit and kill the fly is because of the small hole in the fly swatter.

The compound eyes of houseflies are composed of about 4,000 small eyes, and the field of view of the entire hemisphere is not blocked, basically the direction in which humans appear, and flies have more than a thousand small eyes staring at you.

When you wave your hand and slap it, the image of the fly's more than 1,000 eyes superimposed immediately triggers the fly's coping strategy, whether to run away or continue to stay still, this process takes about one-tenth of the human reaction time, so you can't shoot the fly with your hand.

The length of the fly swatter is about, which is equivalent to increasing the length of a hand, then the end speed will be increased by 2 times, plus the fly swatter is relatively thin, and the background color is easy to mix, and the fly swatter is gridded, the disturbance to the air flow is relatively small, and the speed is combined in a concealed way to successfully shoot the fly.

Because the eyes of the flies are compound eyes, when the hand is not close, the compound eyes of the fly have already detected the arrival of the hand, so they can avoid it in time; However, the fly swatter has many holes, and although the compound eye of the fly can find a few holes, it cannot find all the holes, so the fly thinks it can avoid all the holes, but it just falls under the other holes, so the fly swatter can be large enough for a fly.

Because the eyes of flies are compound eyes. When one hand is not close yet. The compound eyes of flies have detected that there are many holes in the restaurant. Arrived at the arrival of the hand. So it can be avoided in time.

Flies can also be hit with chopsticks, and the success rate is still very high, and playing chopsticks is to win by speed, and it has been hit before you notice it. In addition, flies are very sensitive to air pressure, and the fly swatter full of holes leaks air to reduce resistance, and it is too late for the fly to notice it.

The fly swatter has a larger area than a hand and has a large coverage area, so it is easy to shoot.

Because the fly is light, the wind blows it away. Fly swatters have mesh so it's fine.

He should have a heat sensitivity, or pressure sensitivity, and if a fly swattes, he can hit it.

There seems to be a special device on the fly.

Because flies are sensitive to changes in air pressure.

There are countless pairs of compound eyes.

Because for a fly, its wings are extremely sensitive, and when the human palm approaches it, it can effectively feel the hot air current, so it will escape quickly.

The main reason for this may be that your brain is rejecting it, swatting flies with your hands; I think this is very understandable, probably because our brains refused to use our own hands to swatt flies in the previous paragraph, which is why when we are swatting flies, our own hands are much more reflective than our brains.

Of course, it's not as fast as a fly, but it's fast with a fly swatter, so you can shoot it.

I think the main reason is that when you use your hands to swatt flies, your heart refuses to accept swatting flies with your own hands, so the brain will block the actions of your hands to a certain extent, and when you use a fly swatter, your heart will not produce too much estrangement, so it will be easier to swatt.

Because the material of the fly swatter is very thin, the weight is small, and it is a net-like structure, which can minimize the air movement, it is difficult for the fly to react, and the fly can be detected when the fly is slapped by hand.

There are still many gaps in the fly swatter, and when the fly is hit, the air flow does not sensitize the fly to catch it, so it is often successful.

There is also a freehand method of swatting flies, that is, you can't shoot forward, put your hands together on top of the flies and swatt the flies to take off just to hit, and it has been tried and tested!

This can also be explained by gas hydrodynamics, because the human hand is a plane, when the palms of the hands are clapped against each other, there is a pressure between the palms of the hands, and there will be a flow of air rushing outward between the palms, and the faster the palm speed, the faster the gas flow, because the fly is agile it uses this air flow to escape.

Because the fly swatter is reticulated, the gas pressure does not change much when the fly swatter is swatted, and it takes about 10 ms for the fly to fly from jumping to flying by its own strength, at which point it is too late to run, and its life is over.

The important thing is not the speed, it will drive the air flow when the hand is clapped, the hand has not yet arrived, the fly has already sensed it, the fly swatter has holes, and it will not drive too much air flow.

I can't shoot the fly directly, but I can catch it with my bare hands! When the fly stops in one place, the palm of the right hand is facing left, the finger is slightly bent, and the palm of the hand is quickly swiped about 10 cm above the fly, so that there is a high probability of catching the fly! I've tried it many times!

The fly reacts quickly, it must fly in the direction of the top, and because it is too fast, it is caught by the palm above!

Hands can catch flies, it takes a certain amount of skill, my uncle grabbed flies with his hands, grabbed a hundred hits, grabbed and smashed to the ground, the real reason why the flies were dizzy was that he was afraid of pain when he clapped his hands with his hands, and he was not afraid of pain with a fly swatter. That's the right answer! I have caught flies and mosquitoes with my bare hands, and I feel nauseous, and once I caught a fly, I flew away with a fly in my hand, and I couldn't pinch the fly with the palm of my hand, it was disgusting.

Flies are sensitive to moving objects, as long as the handle is slowly approaching, pausing from time to time, there is still a chance to hit the fly, the fly is sensitive to air currents, and it is difficult for human hands to do it, so they can only approach it slowly, and when the distance is very close, the fly will not have time to react.

Otherwise, this is the reason why fly swatters can be sold.

Because there are a lot of compound eyes in flies, the speed of human palms is too slow, and the area is relatively small, so it is difficult to photograph. Whereas, the fly swatter area is relatively large.

The area of the fly swatter is very large, and the force surface of the fly swatter is also relatively wide, so it is particularly easy to swatt flies.

Because the fly swatter has a relatively large area, it is very easy to hit small objects such as flies, so it will be very easy to hit flies.