论文部分内容阅读
一、公式概念,理解不透彻,频频导致错误,常见情况如下:1.对压强公式P=F/S中压力和受力面积理解不透彻,容易误判。解题中一要明确压力概念,二要明确受力面积是指物体间受力的共同接触面积,举例剖析,以供学习参考。例1如图所示,质量为60kg的滑雪运动员小亮,其脚下每块滑雪板面积为2×103cm2、重为10N.求运动员站立时,水平雪面受到的压强.(g取10N/kg)
First, the concept of the formula, the understanding is not thorough, frequently lead to errors, common situation is as follows: 1. Pressure formula P = F / S in the pressure and stress area understanding is not thorough, easy to misjudgment. Solve a problem in a clear concept of stress, the second is to clearly stress area refers to the common contact area between the force by force, for example, for reference. Example 1 As shown in the figure, a skier with a mass of 60kg is small and light, with a snowboard area of 2 × 103cm2 and a weight of 10N at the foot of the skis, to find the pressure on the horizontal snow surface when the player stands (g / 10N / kg)