112简谐运动的五个特征及其应用 精讲精练-2022届高三物理一轮复习疑难突破微专题
112简谐运动的五个特征及其应用一.必备知识1.简谐运动的概念如果物体的位移与时间的关系遵从正弦函数的规律,即它的振动图像(x-t图像)是一条正弦曲线,这样的振动是一种简谐运动。动力学表达式:F=-kx,其中“-”表示回复力与位移的方向相反。运动学表达式:x=Asin(ωt+φ0),其中A表示振幅,ω==2πf表示简谐运动的快慢,ωt+φ0表示简谐运动的相位,φ0叫作初相简谐运动的图像如右图所示。物理意义:表示振动质点的位移随时间的变化规律。任一时刻在图线上对应点的切线的斜率绝对值表示该时刻振子的速度大小,斜率正负表示速度的方向,斜率为正时,表示振子的速度沿x轴正方向;斜率为负时,表示振子的速...
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