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5.C【解析】物体[文]A、B在N或N'时,A、B之间的摩[章]擦力最大,把A、B[来]作为一个整体进行分[自]析,根据牛顿第二定[知]律可得kx=3m1[嘛]a,对A进行受力分[答]析可得F=m1a,[案]又由于F1≤/mg[网],解得≥3,A错误[文];从N到O31g的[章]过程中,对A、B和[来]弹簧组成的系统进行[自]分析,根据功能关系[知]可得E,?(m1+[嘛]2m1)va,对物[答]体B进行分析,根据[案]动能定理可得Ep+[网]W=2×2m;,解[文]得E,B错误;当A[章]、B运动到O点时,[来]A、B的速度3最大[自]时,把A拿走,系统[知]的机械能将减小,弹[嘛]簧的最大弹性势能将[答]减小,振幅将减小,[案]C正确;当A、B运[网]动到N点时,若把A[文]拿走,系统的机械能[章]不变,振幅不变,在[来]振动过程中的某一位[自]置,拿走A后.质量[知]将减小,加速度变大[嘛],振动的周期将减小[答],D错误。故选C
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