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功是能转化的量度.物体受力发生形变或改变运动状态时往往牵涉能量的转移或转化过程.在“简单机械”的教学中,教师在分析问题时,注意以“功”为工具
Work is a measure of transformation. When an object is deformed or changes its state of movement, it is often involved in the process of energy transfer or transformation. In the teaching of “simple machinery,” teachers should pay attention to “work” when analyzing problems. Tools