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一次函数y=kx+b,它反映了因变量y随自变量x线性变化的关系.一次函数y=kx+b的图像是一条直线,若已知(x_1,y_1)、(x_2,y_2)为图像上的两点,则斜率k=(y_2-y_1)/(x_2-x_1),b为截距.由于支配物理世界的规律具有简单性,根据物理规律建立的物理量之间的关系有很多都是线性关系,即使不是线性关系,恰当选取变量也能“化曲为直”将其转化为线性关系.近年来全国各地的物理高考实验试题中多次出现对物理量之间的线性关系的考查,
The first-order function y = kx + b, which reflects the linear relationship between the dependent variable y and the independent variable x. The image of the linear function y = kx + b is a straight line. If x1, y_1, Is the slope of k = (y_2-y_1) / (x_2-x_1) and b is the intercept, which are the two points on the image. Due to the simplicity of the laws that dominate the physical world, there are many relationships between the physical quantities established by physical laws Are linear relationships, even if it is not a linear relationship, the appropriate selection of variables can also be “straightforward” to convert it into a linear relationship in recent years across the country in the physical entrance examination questions appeared repeatedly on the linear relationship between physical quantities Test,