What is the use of brush like pads on the soles of geckos feet?

When suction cups, prevent falling off the wall.

Most people would think that geckos can stick to a smooth ceiling with the help of magical suction cups on the soles of their four feet, but this is not the case.

The power of the soles of its feet comes from the most basic physical principle of the universe——— molecular gravity.

A microscopic look at the paws of a gecko's feet shows that it has millions of tiny bristles growing on the bottom of each foot, and about 400 to 1,000 finer branches at the end of each bristle. This fine structure causes the bristles to be very close to the molecules on the surface of the object, resulting in molecular gravity. While the force produced by each bristle is insignificant, it adds up to a significant amount.

According to calculations, one bristle is capable of lifting the weight of an ant, while 1 million bristles, although they occupy less than the area of a small coin, can lift the weight of 20 kilograms of force. If the gecko uses all the bristles at the same time, it will be able to support 125 kgf. Scientists say that geckos are actually able to support their entire body using only one leg.

How do geckos control the suction on their feet? Scientists used a microcamera to record a gecko crawling on the glass and found that when a gecko tried to move the ball of its foot, it needed to exert 600 times more force than it would if it sucked into the attachment and extended its toes more than 30 degrees to do so, just as people do when they pulled off adhesive tape. Moreover, even in a vacuum, the adhesion on its feet does not fail, which means that the gecko does not have to secrete anything to maintain adhesion and does not need to "suck" objects with the help of negative air pressure.

a, the brush-like meat pad on the gecko's body, increase the roughness of the gecko's foot surface, increase the friction between it and the wall, and facilitate it to walk on the wall does not conform to the theme

B. The pointed beak of the woodpecker is under a certain pressure, and it is not in line with the topic to increase the pressure by reducing the force area

c. The mucus on the surface of the loach body is to reduce the roughness of the contact surface to reduce the friction between the loach and the silt when the pressure is constant, and it is easy to walk through the mud

d. The sole of the camel's foot is very large, and when the pressure is constant, increase the force area to reduce the pressure in line with the topic

Therefore, choose D

a. There are rough scales on the surface of the snake body when the pressure is constant, increase the roughness of the contact surface to increase the friction between the snake body and the ground, so as to facilitate the movement on the ground

b. There are meat pads on the feet of geckos, which rely on the action of atmospheric pressure to adsorb on the vertical wall and walk on the theme

c. The thread on the finger is to increase the roughness of the contact surface to increase the friction between the hand and the object when the pressure is constant, so that the object is not easy to slide off It does not conform to the topic

d. The mucus on the body surface of the loach is to reduce the roughness of the contact surface to reduce the friction between the loach and the silt when the pressure is constant, and it is easy to walk through the mud in line with the theme

Therefore, choose D

a. There are rough scales on the surface of the snake body when the pressure is constant, increase the roughness of the contact surface to increase the friction between the snake body and the ground, so as to facilitate the movement on the ground

b. There is a meat bucket mat on the gecko's feet, and it is not in line with the theme to walk on the vertical wall by relying on the effect of celery rent atmospheric pressure

c. The thread on the finger is to increase the roughness of the contact surface to increase the friction between the hand and the object when the pressure is empty, so that the object is not easy to slide off and does not conform to the topic

d. The mucus on the body surface of the loach is to reduce the roughness of the contact surface to reduce the friction between the loach and the silt when the pressure is constant, and it is easy to walk through the mud in line with the theme

Therefore, choose D

a. The mucus on the surface of the loach body is to reduce the roughness of the contact surface to reduce the friction between the loach and the silt when the pressure is constant, and it is easy to walk through the mud in line with the theme

b. The rough scales on the surface of the snake body are when the general pressure is constant, increase the roughness of the contact surface to increase the friction between the snake body and the ground, so as to facilitate the bending and marching on the ground

c. The gecko's feet are long and stuffy with meat pads, and they rely on atmospheric pressure to adsorb on the vertical wall and walk on the vertical wall, which does not conform to the theme

d. The thread on the finger is to increase the roughness of the contact surface to increase the friction between the hand and the object when the pressure is constant, so that the object is not easy to slide off It is not in line with the topic

So choose A

a. The mucus on the body surface of the loach is to reduce the roughness of the contact surface to reduce the friction between the loach and the silt when the pressure is constant, and it is easy to walk through the mud in line with the topic

B, the snake body surface has rough scales is to increase the roughness of the contact surface to increase the friction between the snake body and the ground when the pressure is constant, so as to facilitate the march on the ground of Qinqin, which does not conform to the topic

c. There are meat pads on the feet of the gecko, which rely on the action of atmospheric pressure to adsorb on the vertical wall and walk on the theme

d. The thread on the finger is to increase the roughness of the contact surface to increase the Moses friction between the hand and the object when the pressure is constant, so that the object is not easy to slide off It does not conform to the topic

So choose A

a. There are meat pads on the feet of geckos, which rely on atmospheric pressure to adsorb on the vertical wall and walk on the theme

B, the snake body surface has rough scales is when the pressure is constant, increase the roughness of the contact surface to increase the friction between the snake body and the ground, so that it is convenient to travel on the ground does not conform to the topic

c. The mucus on the body surface of the loach is to reduce the roughness of the contact surface to reduce the friction between the loach and the silt when the pressure is constant, and it is easy to walk through the mud in line with the theme

d. The thread on the finger is to increase the roughness of the contact surface to increase the friction between the hand and the object when the pressure is constant, so that the object is not easy to slide off It is not in line with the topic

Therefore, C

It should be the mucus on the surface of the loach, because the rest is roughness and increased pressure, only he is, is to reduce friction. Without friction, we can't do that at all, and it's hard for people to walk the aisle.

Mucus on the body surface of a loach. Because the way to reduce friction is to reduce the roughness of the contact surface and the area of the contact surface. Mucus is reduced rough area.

People are running faster than ever. If there is no friction, it will not stop, right?

There is no friction, you can't hold the pen, and the pen will be swept away from your hand.

a. The mucus on the surface of the loach body is to reduce the roughness of the contact surface to reduce the friction between the loach and the silt when the pressure is constant, and it is easy to pass through the mud, so A does not meet the topic;

B, the brush-like meat pad on the gecko's body increases the roughness of the gecko's foot Bizhao surface, increases the friction between it and the wall, and facilitates it to walk on the wall again, so B does not conform to the topic;

c. The woodpecker's pointed posture rents its beak, which is in the case of a certain pressure, and increases the pressure by reducing the force area, so C is in line with the topic;

d. The rough scales on the snake's body, increase the roughness of the contact surface to increase the friction between the snake body and the ground, and facilitate the travel on the ground of the source of the book, so D does not conform to the topic;

Therefore, C