弹簧振子在光滑水平面上做简谐运动,在振子向平衡位置运动的过程

弹簧振子在光滑水平面上做简谐运动,在振子向平衡位置运动的过程中(    )

A.振子所受的回复力逐渐增大

B.振子的位移逐渐增大

C.振子的速度逐渐减小

D.振子的加速度逐渐减小

答案

解析:振子位移是指由平衡位置指向振动物体所在位置的位移,因而向平衡位置运动时位移逐渐减小,而回复力与位移成正比,故回复力也减小,由牛顿第二定律a=F/m得,加速度也减小,物体向着平衡位置运动时,回复力与速度方向一致,故物体的速度逐渐增大,正确答案选D.

答案:D

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