On the basis of our analysis of some physical textbooks, and from the view of transformation of energy, this paper gives an essential idea on the pulling force.
本文在分析目前国内外物理教科书中关于牵引力的提法之后，从能量转换的角度，提出了关于牵引力本质的一种看法。
It firstly derivates theoretical analysis formula of force and stroke by using beam bending theory and energy method.
首次采用梁的弯曲理论和能量法结合的方法推导了弯曲力和行程的理论解析公式。
This paper gives brief analysis of vehicle crash computer simulation, the statstics analysis rules of car to car, car to truck and the rules of energy and force in the crash are given.
对汽车碰撞计算机模拟方法作了简要的分析，给出了轿车碰撞轿车、轿车碰撞货车、碰撞过程中能量、碰撞力的变化规律。
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