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动能定理的内容是:合力所做的功等于物体动能的变化.数学表示式为w=Ek2-Ek1.动能定理是一个重要且应用广泛的定理,它从功、能的角度揭示了对过程和状态的有机联系.在动能定理表示式的左边为合力做的功,它表示合力作用了一段距离的一个力学过程量.如果此力为恒力,则此过程比较简单;如果此力为一个变力,那么此过程可能非常复杂,以致有时很难对它进行研究.该定理表示式的右边,为同一力学过程末、初两状态的动能差,只要知道此二时刻物体的速度,便可简便求得.动能定理把一个可能很复杂的力学过程与较简单的力学状态联系起来了,从而在很多情况下可以不理会一
The content of the kinetic energy theorem is: the work done by the resultant force is equal to the change of the kinetic energy of the object. The mathematical expression is w=Ek2-Ek1. The kinetic energy theorem is an important and widely used theorem. It reveals the process and the The organic relationship of states. On the left side of the expression of the kinetic energy theorem is the work done by the force. It represents the amount of a mechanical process in which the resultant force acts for a distance. If this force is constant, the process is relatively simple; if the force is a change Force, then this process may be very complicated, so sometimes it is difficult to study it. The theorem represents the right side of the equation, which is the kinetic energy difference between the last two states of the same mechanical process. If we know the speed of the object at this time, it can be simple Finding. The kinetic energy theorem associates a potentially complex mechanical process with a simpler mechanical state, so that in many cases it can be ignored.