如图所示以水平力f压在物体a上这时a能够沿竖直墙面下�若a与墙面间的�动�擦因数为μa的质量为m那么a与墙面间的�动�擦力的大小为 Template




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tomski如图所示以水平力f压在物体a上这时a能够沿竖直墙面下�若a与墙面间的�动�擦因数为μa的质量为m那么a与墙面间的�动�擦力的大小为 coloring