摘要
From the physical science, we know the force comes from the reaction between at least two objects. But, in the reality world, we can see some kind force of an existence does not come from outside. For instance, when a person takes the action such as speaking, movement of arms, we cannot see any force loaded from outside of this person. Then, here is the question: Where does this kind of force come from? This paper is to demonstrate to prove that there is the second source of force, which comes from internal of a kind of object.