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图象是描述物理过程、揭示物理规律、解决物理问题的重要方法之一.对图象的正确理解,往往能反映出一个学生对物理问题的深入理解程度.由于中学生接触较多的是 s-t 图象和 v-t 图象,本文试图对其他图象所围面积进行讨论,以起抛砖引玉的作用.一、图象所围面积——功1.F-s 图象所围面积例1 水平桌面上放着一根伸长的均匀柔绳,绳的一端恰好位于桌面上的一小孔上,绳长为 l,质量为m.一根轻绳通过小孔与绳头连接,下端悬挂一个质量为 m 的物体.开始时用手按着柔绳尾使它们保持静止,然后放开手让它们运动.设绳与桌面间的摩擦因数为μ,则绳尾滑到桌上的小孔时,绳和物体的速度大小为__.解析由于摩擦力的大小是线性变化的,如图1所示,摩擦力所做的功为
Image is one of the important methods to describe physical processes, reveal physical laws, and solve physical problems. Correct understanding of images can often reflect a student’s deep understanding of physical problems. Image and vt image, this article attempts to discuss the area surrounded by other images, in order to play a role in attracting attention. First, the area surrounded by the image - power 1.Fs The area surrounded by the image Example 1 Horizontal desktop is placed on a A uniform and flexible rope with an elongated root. One end of the rope is located exactly on a small hole in the table. The length of the rope is l, and the mass is m. A light rope is connected to the rope head through the small hole, and an object with a mass of m is hung on the lower end. Start with the soft cord tails by hand to keep them still, then let go and let them move. Set the friction coefficient between the rope and the table to μ, then slide the rope tail to the hole in the table, the rope and the object The speed is __. Since the frictional force changes linearly, as shown in Figure 1, the frictional force is