Both cats and dogs drink by licking, but when slowed down, you will find that their drinking movements are different. Why is this?

Both cats and dogs drink by licking, but when slowed down, you will find that their drinking movements are different. Why is this?

First of all, the dog’s tongue is very soft. After he put his body into the bathtub, both sides rolled down, and there was a hook on the tip of the tongue. Form a spoon into the shape of a spoon. Then shut your mouth. One spirit seems to be added water.

How is water brought up by the tongue? Scientists believe that when the tongue contacts the liquid at a certain speed and leaves, the water has a certain viscosity, and the transfer of momentum will cause part of the water to be taken away from the water due to inertia, just like a car throwing people out when braking. Due to gravity during the ascent, the water's rising speed continues to slow down and can only reach a certain height. Throughout the force analysis, viscous and capillary forces are negligible.

So when a cat licks water, it does not scoop the water into its mouth with its tongue, but uses inertia to bring the water up and then hold it in its mouth. The frequency of cats licking water is a perfect balance between inertia and gravity. If it is faster or slower, it will not be able to drink the most water.

In order to verify that his idea is correct, that is, the frequency of a cat licking water is determined by gravity and inertia, the scientist made a model to reproduce the moment of licking water. The size of the disk on the model and the cat's The area of ??the tongue that touches the liquid surface is the same size. This model will contact the surface of the water vertically, and by changing the size and speed of the contact surface, we can observe the impact of these two factors on the volume of water brought up.

To sum up, it can be said that although cats and dogs have the same licking mechanism, dogs cannot control the penetration depth of their tongues when licking water, and the flowers will sting. At that time, she and the The floor is soaked; when the cat licks the water, there will be a relatively stable water column, and the movement seems to be clean. For example, if the cat jumps into the water and presses flowers, then the dog is an ordinary person. Scientists used high-speed photography to carefully observe the drinking movements of cats and dogs and found that they were not actually licking. They first put their tongues into the water, then bend the tip of their tongues backwards and quickly retract their tongues, which will suck some water into their mouths. This "sucking" takes advantage of the surface tension of water.