How can nature be so irregular?

Junior high school classmates, have you learned trigonometric functions???

In your formula, if you assume that the friction system u is 1, f=g*(sina + cosa), you can try to draw the curve using the dotting method.

You will notice that this force varies with the slope and does not increase monotonically. If U is small enough to a certain extent, the sum of sina + ucosa will be less than 1.

From a physical point of view, what you understand to be laborious is that it can be laborious to lift vertically (overcome gravity) along an inclined slope than to pull it up. Of course, if the object is raised by the same height, there is a horizontal displacement when pulled on an inclined plane. The forces that are used to make the object move in the horizontal direction.

However, in general, when using an inclined plane, the coefficient of friction is reduced as much as possible. For example, in ancient times, there were no cranes, so materials could only be transported to higher places by building slopes.

It can be said that it is not certain whether the inclined plane is more laborious than the vertical lift; But if you raise the same height, it will be more work!

Isn't it reasonable? I don't think that's reasonable!

Friction plus sliding force, of course, it is possible to be greater than gravity, not to say that the inclined plane must be labor-saving?

If you put a not-so-heavy object on a rough bevel, it may be more laborious!

For example, if the bevel is coated with a layer of adhesive, the object may still be sticky, which is much greater than gravity pulling!

You think it's unreasonable, it's because you think the inclined plane must be labor-saving, but you came up with this sentence yourself, and this conclusion is wrong.

No one says that inclined planes are necessarily less labor, and maybe more laborious, and that's just the way it is!

First of all, most sliding friction coefficients are less than 1, but not necessarily all of themFor example, when one piece of sandpaper slides and rubs on another piece of sandpaper, the sandpaper-to-sandpaper coefficient is greater than 1.

In addition, you misunderstood the meaning of inclined plane labor-saving. The so-called inclined plane is a small resultant force can produce a larger component, if you learn the high school parallelogram rule, you will know, not what you say, the use of the inclined plane is to use the inclined plane along the wedge-shaped part of the movement to produce the same effect of the force required is less than direct push.

The so-called inclined plane labor-saving is relative, and only the mass of the object to be moved is large enough to save labor.

When you say labor, you're actually laboring.

The inclined plane is labor-saving and not labor-saving.

The ratio of the length of the inclined plane to the vertical distance is larger and more labor-saving, but the more labor-intensive.

The term "law of nature" has many meanings, so it is difficult to give a clear and appropriate definition. There are roughly four meanings: first, the law of Tao (referring to the nature that energy follows to maintain its own stability, which is equivalent to "spirit"); 2. Derivation (refers to the law of evolution of a specific existence); 3. Inevitable phenomena and laws; Fourth, Zhongzheng.

The golden mean).

Eating while hungry and drinking while thirsty is the "natural law" of the laws of nature, that is, the laws of living things.

Immortality violates the "laws of nature" of the laws of nature, that is, the laws of living beings.

Winter cold and summer heat are the "natural laws" of natural laws, that is, inevitable phenomena and laws.

The gentleman conforms to the "natural law" of the natural law, that is, the way of the middle (mean).

The laws of nature refer to the intrinsic and inevitable relationship between the movement, change and development of objective things without human intervention. Also called the laws of nature.

According to the idea that there is truth in natural things, there is also a hint to create new things, and the following is an example:

1. Einstein once rose and fell from a chair, ignoring the pain in his body, and still thinking about why he fell straight from the chair, so as to conclude that objects always move in the direction of least resistance, which inspired him to study the "general theory of relativity".

2. When Watt was a child, he had the question that the lid of the kettle would beat when the water was boiled, so he realized the powerful power of water vapor, and after years of research, he successfully invented the steam engine.

3. Human beings were inspired by birds and fish to invent airplanes and ships, the streamlined shape of the fish body gave people a great inspiration, so the external shape of the ship is also streamlined, which can well reduce the resistance of the water, Fu Xiang and, the fish can float up mainly because it has a swim bladder, and the boat can float on the surface of the water is also modeled on the principle of the swim bladder, and a lot of watertight cabins are made under the boat to ensure the buoyancy of the ship.

4. Young Isaac Newton was sitting in the garden when an apple fell on his head, and he came up with the law of gravitation. We can use the law of gravitation, discovered by Newton, to prove that the laws of nature are objective.

5. The world's first steam locomotive was built by Derek Wiesk from Watt's steam engine. The speed of the engine is 5 to 6 kilometers per hour. Since coal or wood was used as fuel at that time, it was called "train", so it has been used to this day.

The laws of nature do not operate by human will, and it is safe to say that they cannot be fundamentally changed. Local changes are difficult and can have unforeseen consequences. However, gradual change is inevitable, and the needs of human survival will certainly remove certain constraints from nature and strive for the necessary conditions for survival.

Human beings survive in the natural environment, and after hundreds of thousands of years of wind and rain erosion, they all rely on nature, use nature, and partially transform the natural environmental conditions in order to facilitate the survival and life of human beings.

The slogan of man conquering the sky is a kind of fine model and good god, and it is a kind of motivation. Inspire humanity to overcome natural disasters and obstacles and achieve greater results.

Man's struggle with nature has accompanied the history of mankind. People's food, clothing, housing and transportation are always in line with the natural environmental conditions, and brilliant results have been achieved, promoting the development and progress of human survival and life.

The history of mankind is a history of struggle. Without the spirit and strength of fighting with nature, fierce beasts, and man himself, human beings cannot survive in nature.

Human beings have partially modified the conditions of the natural environment, and some people have existed since they were born. In order to survive, human beings have to modify local natural environmental conditions in order to survive and live.

Plants, moving sheds, and materials in nature have been transformed, turning them into food, clothing, supplies, and tools for human survival and life.

We will further manufacture more scientifically advanced automobiles, airplanes, rockets, artificial satellites, spacecraft, and other appliances to improve the quality of human life.

However, nature has a certain law, and it is necessary to seek a certain material balance. Human beings excessively exploit, transform, and destroy the natural environment, causing it to lose a certain material balance. It will cause unexpected natural disasters and plagues, which will catch human beings off guard and cause serious harm.

The transformation of nature by human beings is a partial change that is gradually exploratory, gradual and scientifically advanced. From small to large, from weak to strong, it is absolutely impossible to break through the bottom line of natural laws. Harm is more than worth the loss.

September 1, 2020.

The laws of nature refer to the universal principles and rules that exist in nature, and they are the basis for the operation of nature. The laws of nature are immutable because they reflect the nature and laws of things in nature. The laws of nature can be studied and described by the scientific method, and scientists have revealed many laws of nature through continuous exploration and discovery, which have had a profound impact on our lives and the development of human civilization.

The laws of nature are universal laws in many fields, including physics, chemistry, biology and the earth. In physics, many laws, such as the famous Newton's three laws and the law of universal gravitation, have had a significant impact on the study of physics. In chemistry, the laws of periodicity, chemical reaction rates, and chemical equilibrium are also the basis of chemical research.

In biology, cell theory, genetic inheritance, and evolutionary theory are also the basis for the study of life. In earth science, there are plate tectonics theory, meteorological laws, and the historical evolution of the earth, which reveal major issues such as earth tectonics, ecological environment, and climate change.

The understanding and application of the laws of nature has had a tremendous impact on all aspects of humanity. Many of the technologies and tools of human society are designed based on the operating principles of the laws of nature. For example, construction and engineering based on natural materials, breeding and artificial pollination have all played an important role in the development of human society.

The application of the laws of nature can also solve the problems of global environmental pollution and population growth, and ensure human safety and survival.

In short, the laws of nature are the basis for the operation of the natural world, which has a profound impact on our lives and the development of human civilization. Strengthening the research and application of the laws of nature will help improve our understanding and mastery of the natural world, and will also provide strong support for the sustainable development of human society. <>

In the world, everything has its own laws of existence, copied from generation to generation, flowers bloom and fall. Sunrise and sunset, life and life do not talk about shelter.

The child came into this world and is also a product of nature, only with the help of your body, she does not belong to you. This is the law of life, this is a fact.

Since the child can come into this world, God must give her the ability to exist, and she will definitely be able to deal with it. And what we are thinking as parents, with our experience, prejudiced thoughts to impose on children, and children are loyal to their parents, entangled, resistant, and have a sense of humiliation after obedience, so powerless to sue the lead, and some blindly obey and lose motivation.

Parents have been thinking that the purpose of the child is good for decades, controlling the child, are you happy, is the child happy, has the child changed?

Ego, how terrible it is, rooted in your head, rooted in your heart, in your mind, in your soul, let go of ego, I think, my guesses, again and again, I find myself so wrong.

The child's shouting again and again failed to awaken you, you are immersed in your own understanding, and you have always wanted to transform others, but you are the one who needs to change the most.

Talk to your inner self, are you happy every day, are you giving, have you thought of returning? Your dedication is actually the standard of your own as a person, or the standard of being a good mother, which is a requirement for yourself, has nothing to do with others, does not need to be praised, and does not need to be reciprocated, isn't it, and most people will morally kidnap others or ask for it when they are not recognized.

When the weather is cold, add clothes, get up early in the morning, study, and don't stay up late at night. Go with the flow, go with the flow.

I don't like others and want to transform them. It is your own heart that is not tolerant, you are powerless, we want to change others, we have been in confrontation, change yourself, influence others, and lead her is the core, this is the law of all things.