动能定理是力学中的重要定理,动能定理反映了做功与能量转化之间的关系,若对物体所做的功为W,物体的能量改变了△E,则有W=△E。一些涉及功和能的转化问题,特别是用动能定理解多过程的运动问题时,不必探究每一子过程的细节,只须从全过程进行分析和处理,即可使问题迅速解决,现在就以下面的例题,说明如何用动能定理解决这方面的问题。 The kinetic energy theorem is an important theorem in mechanics. The kinetic energy theorem reflects the relationship between work done and energy conversion. If the work done by an object is W, the energy of the object changes by ΔE, then there is W=△E. Some involve the conversion of work and energy, especially when using kinetic energy to understand the motion of multi-processes, without having to explore the details of each sub-process, but only from the whole process of analysis and processing, you can quickly solve the problem, now The following examples illustrate how to use the kinetic energy theorem to solve this problem.