恒力做功可用公式W=Fscosα来求解,但如果是变力做功,即力的大小或方向在做功过程中发生了变化,就不能简单套用该公式了.那么,在高中知识范围内如何处理有关变力做功的问题呢?下面结合例题谈谈解决变力做功问题的七种方法.一、利用动能定理求解例1如图1所示,在一光滑水平桌面的 Constant force work can be solved by the formula W=Fscosα, but if it is inverting work, that is, the magnitude or direction of force changes in the process of doing work, you can not simply apply the formula. Then, how to deal with related issues in the high school knowledge What are the problems with inflectional work? Here are seven methods for solving the problem of inverting work. The first is to use the kinetic energy theorem to solve the problem in Example 1, as shown in Figure 1, on a smooth horizontal desktop.