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高中物理力学部分所涉及到的功，不外乎这么几种情况；恒力做功的计算、变力做功的计算和变力做功的定性分析。这些功除一般性变力做功的定量计算由动能定理解决外，其立功大部分均可由公式W＝FScosa来分析解决，关键是要对该公式有一个正确的理解和灵活的运用。一、运用公式W
The work involved in the physical and mechanical part of senior high school is nothing more than such situations; the calculation of constant force work, the calculation of variable force work, and the qualitative analysis of variable force work. In addition to the quantitative calculation of the general variational work performed by the kinetic energy theorem, most of its merits can be analyzed and solved by the formula W=FScosa. The key is to have a correct understanding and flexible application of the formula. First, use the formula W