作图法是研究物理量之间变化规律的最常用方法之一,它可把一系列数据之间的变化情况用图线直观地表示出来,从而能简便地从图象中求出实验需要的某些规律或结果。特别是一元线性的函数关系——y=ax+b,通过作图,其图象是一条几何直线,这一点就尤为重要,因为直线图象在绘制上最为方便,且可从直线的斜率求出a值,从截距求出b值,并进一步求出 Drawing is one of the most commonly used methods for studying the changing laws between physical quantities. It can intuitively display the changes between a series of data, so that it can be easily obtained from the image. Some rules or results. In particular, the function of the unitary linear relationship, y=ax+b, is a geometrical straight line. This is particularly important because straight-line images are most conveniently drawn and can be obtained from the slope of the straight line. Out a value, find the b value from the intercept, and further find