Abstract: this paper points at that the resultant braking force point of drum brake is on the base circle and finds the relation between the structural parameters of shoe block and moment of force.
文摘：该文阐明制动力的合力点在基本圆上，并找出蹄块结构参数与制动力矩之间的关系。
A simple type is that the forces on two dynamic point charges have the same direction, the scale of the forces are changeable with sine regularity and its' resultant force is stable and nonzero.
对动态电荷群的研究得知能够实现这种悬浮力。 较简单的情形是只要两个动态点电荷满足三个条件，它们各自受到的力就会指向同一方向，力的大小按正弦规律变化，合力不为零且稳定不变。
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