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如何求解用绳子连接的物体的速度关系问题,是中学物理教学的一个难点,一些物理杂志对这个问题也进行了探讨。笔者在教学实践过程中,总结了一种方法——绳子速度相等法。教学效果易懂、简便、实用。 一、方法 (1)中学物理习题中的绳子一般都不计质量和形变,因此当绳子拉紧时,绳子上各点沿绳子方向的速度大小必是相等的; (2)把连在绳子上的物体的实际运动速度分解成沿绳子和垂直绳子的两个分速度; (3)根据两个物体沿绳子方向的速度大小相等列出等式,即可求出它们之间的关系。
How to solve the speed relationship problem of objects connected with a rope is a difficult point in the physics teaching in middle school. Some physics magazines have also discussed this issue. In the process of teaching practice, the author summarizes a method—the equal speed of rope. The teaching effect is easy to understand, simple and practical. First, the method (1) of the middle school physics exercises in the rope is generally not counted in the quality and deformation, so when the rope is tightened, the speed of the rope along the direction of the rope must be the same size; (2) attached to the rope The actual velocity of the object is decomposed into two sub-velocities along the rope and the vertical rope. (3) The relationship between the two objects can be obtained by listing the equations based on the velocity of the two objects in the direction of the rope.