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非匀变速直线运动一直是高中物理教学想回避而又回避不了的一个问题.通常的做法是,将非匀变速直线运动从匀变速直线运动的角度去认识、分析,然而对某些问题,此种分析显得抽象、呆板,且往往无法将问题表述明白.笔者从V-t图象的斜率——加速度入手,找到了一个解决非匀变速直线运动的好方法.现举两例:例1.一列车在恒定功率机车的牵引下由静止自车站出发,行驶5分钟速度达到72千米/小时,设列车在行驶过程中所受阻力恒定,那么,列车在这段时间内行驶的距离:
Non-uniform speed linear motion has always been a problem that high school physics teaching would like to avoid but can not avoid. The usual practice is to recognize and analyze the non-uniform speed linear motion from the perspective of uniform linear motion, but for some problems, this This kind of analysis is abstract and rigid, and it is often impossible to understand the problem. The author started with the slope of the Vt image—acceleration and found a good way to solve non-uniform linear motion. Here are two examples: Example 1. A train Under the traction of the constant power locomotive, from the standstill station, the speed of 5 minutes to reach 72 km/hour, set the resistance of the train during the driving process is constant, then the distance the train travels during this period: