Founding the unified forces theory is the objective pursued by physicists over the years, but nobody has succeeded yet. The paper has studied it from the point of hydromechanics. Firstly, it suggests the model that universal things are made of microparticles, they are basic celb of material. Orderly flowing microparticles in space constitutes the continuous medium and the velocity field, so microparticles are of fluid characters. Secondly, three forces are introduced by a identical equation of moving micellas in hydrodynamics, they are variable speed force, energy gradient force and vorticity force. In addition, large amount of the moving micellas also have pressure that generate the pressure gradient force, as general fluid does. Four forces exert on an object in the moving field filled of micellas, thereby Movement Equation of objects is established, which is Grand Unified Equation, and physical meanings of gravitational potential and vector potential are explained. The principle of the nature balance is put forward. In equilibrium conditions, the equilibrium moving equation is derived, and the causes of Coulomb force and the Lorentz force are briefly described.%建立力的统一理论是很多物理学家多年来所追求的目标,但至今没有人获得成功.从流体力学的角度对此进行了研究.首先提出了物质构成的微子流体模型,指出宇宙万物都是由一种及其微小粒子组成,这种微小粒子(简称微子)是构成物质的基本单元,有序流动的微子在空间上构成了连续介质和速度场,因而具有流体特征,然后利用流体力学中微团运动的一个恒等式引入了3个基本力:变速力,能量梯度力和涡度力,另外,大量运动的微子和普通流体一样也具有压力(或压强),由此产生压力梯度力,物体在微子组成的运动场中受到这4个力的作用,由此建立了物体的运动方程,并解释了引力势和矢量位的物理意义.提出了自然界的平衡原理,在平衡条件下导出了平衡运动方程,并简单说明了库仑力和洛伦兹力产生的原因.
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