The force of the earth's rotation did not come out of thin air, but appeared constantly at the beginning of the formation of the solar system. This force is influenced by the explosion of primitive nebulae and the rotation of these substances. That is to say, at the beginning of the earth's formation, these substances were rotating and then gave a primitive force. At that time, the rotation was much faster than now, because some scientists speculated that before the appearance of human beings, the speed of the earth's rotation was faster than now, perhaps only 20 to 22 hours, and now it is much slower than before. It is predicted that the rotation speed of the earth will decrease in the future, and it may not stop for 24 hours.
The decrease of the earth's rotation speed shows that the energy contained in the earth is decreasing. This is a very slow process, which we can't feel in a short time, and its impact on human beings living on the earth is very limited in a short time, because its speed is gradually slowing down, and it won't have much impact, but if one day the earth rotates very slowly and approaches zero infinitely, then the energy of the whole solar system will basically be exhausted. By then, the solar system may not be suitable for human survival, because the energy of the earth has been exhausted and the sun is almost the same. Without light and heat, human beings can't survive.
It is too early to consider when the energy of the sun and the earth will run out, because such a process will be very slow and will not stop for tens of millions or even hundreds of millions of years. For us at present, it is too far away and has little to do with us. What we have to do is to constantly develop new science and technology, improve our way of life and improve our living standards, so that people can survive and even live better.