如图所示以水平力f压物体a这时a沿竖直墙壁匀速下�若物体a与墙面间的动�擦因数为μa物体的质量为m那么a物体与墙面间的�动�擦力大小 Template




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tomski如图所示以水平力f压物体a这时a沿竖直墙壁匀速下�若物体a与墙面间的动�擦因数为μa物体的质量为m那么a物体与墙面间的�动�擦力大小 coloring