功的计算公式为W=Flcosα,可见功由两个矢量(一个是力、另一个是位移)的积求出。功却是标量,这让学生如何理解呢?功这节课的教学重点应是做功的两个必要因素,功的计算公式理解应用、正负功的意义及总功的求法。功是标量是本节课的难点,却不是重点。如何在解决重点问题时,突破难点,是摆在每一个老师面前必须解决的问题。功是标量可以从以下几个方面来 Work is calculated as W = Fl cosα, where work can be found by the product of two vectors (one is force and the other is displacement). Work is scalar, which makes students how to understand it? The teaching of this lesson should focus on the two necessary factors, the formula for calculating the application of understanding, the meaning of positive and negative work and the total power of the law. Work is a scalar This lesson is difficult, but not the point. How to break through the difficulties when solving the key problems is a problem that must be solved before each teacher. Work is a scalar from the following aspects