1选好实验方案,掌握科学方法以“功”的构建过程为例,教科书一改传统做法,从前两节刚学到的杠杆、滑轮、斜面等机械所发现的普遍特点:使用机械,若省力就得多移动距离;若省距离,必费力.这一基础上,进一步深入探究斜面,测出几组数据后发现:F.s与G.h近似相等.便将力与物体在力的方向上通过距离的乘积定义 1 Select the experimental program to master the scientific method to “power ” of the building process, for example, textbooks changed the traditional approach, just learned two previous levers, pulleys, bevels and other mechanical found common features: the use of mechanical, If the effort is much more to move the distance; if the provincial distance, it is necessary to exert effort .On this basis, to further explore the slope, measured several sets of data found: Fs and Gh approximately equal, then the force and the object in the direction of the force Distance product of the definition