有关研究表明,雨滴在空中下落的过程中,速度v较小时,雨滴受到空气阻力f与下落的速度v成正比,即f=kv;速度v较大时,雨滴受到空气阻力f与下落速度v的二次方成正比,即f=kv2.对此,笔者对雨滴在重力和空气阻力作用下下落加速度随时间变化的图像进行了研究.1雨滴下落速度较小的过程雨滴下落速度较小时,雨滴受到的阻力f=kv.根据牛顿第二定律有mg-f=ma,即 Related studies have shown that when the raindrops are falling in the air, when the velocity v is small, the raindrops are affected by the air resistance f which is proportional to the falling velocity v, that is, f = kv; when the velocity v is large, the raindrops are affected by the air resistance f and the falling velocity v Is proportional to the square of the second, that is, f = kv2. In this regard, the author of the drop in the gravity and air resistance under the action of the acceleration of the image changes with time .1 raindrop drop speed smaller raindrops less speed, Resistance to raindrops f = kv. According to Newton’s second law there mg-f = ma, that is