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图像法是描述物理过程、揭示物理规律的重要方法,可以形象、直观地反映物体的运动过程,使问题的求解过程更加优化、简捷。特别是v-t图像,从中可以直接看出物体的速度随时间的变化,并由斜率求出其加速度,还可以根据图线下的“面积”求出其运动位移,所以使用最多。下面举例谈谈如何利用v-t图像求解运动学问题。一、求运动时间例1火车从某站出发,开始以加速度a_1做匀加速直线运动,当速度达到v时,再匀速行驶一段时间,然后又以加速度a_2做匀减速直线运动直到停止,如果火车经过的位移为s,求火车行驶的时间t。
Image law is an important method to describe the physical process and reveal the laws of physics. It can vividly reflect the movement process of objects and make the process of solving problems more optimized and simple. In particular, v-t images, from which you can directly see the speed of the object changes over time and calculate the acceleration from the slope, but also can be based on the line under “area ” to find the displacement of its movement, so the most used. Here’s an example of how to use v-t images to solve kinematic problems. First, seeking exercise time Example 1 train starting from a station, began to do a uniform linear acceleration acceleration a_1, when the speed reaches v, and then travel at a constant speed for some time, and then deceleration with a deceleration deceleration linear until the stop, if the train After the displacement of s, find the train traveling time t.