如图所示,质量为m的木块在水平力F的作用下,静止在水平墙面上,物体与墙面间的动摩擦因数为u,则物块受到的摩擦力大小是( ),若物块在水平推力F作用下沿竖直墙面加速下滑,则物块受到的
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![如图所示,质量为m的木块在水平力F的作用下,静止在水平墙面上,物体与墙面间的动摩擦因数为u,则物块受到的摩擦力大小是( ),若物块在水平推力F作用下沿竖直墙面加速下滑,则物块受到的](/uploads/image/z/4735617-33-7.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E6%9C%A8%E5%9D%97%E5%9C%A8%E6%B0%B4%E5%B9%B3%E5%8A%9BF%E7%9A%84%E4%BD%9C%E7%94%A8%E4%B8%8B%2C%E9%9D%99%E6%AD%A2%E5%9C%A8%E6%B0%B4%E5%B9%B3%E5%A2%99%E9%9D%A2%E4%B8%8A%2C%E7%89%A9%E4%BD%93%E4%B8%8E%E5%A2%99%E9%9D%A2%E9%97%B4%E7%9A%84%E5%8A%A8%E6%91%A9%E6%93%A6%E5%9B%A0%E6%95%B0%E4%B8%BAu%2C%E5%88%99%E7%89%A9%E5%9D%97%E5%8F%97%E5%88%B0%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B%E5%A4%A7%E5%B0%8F%E6%98%AF%EF%BC%88++%EF%BC%89%2C%E8%8B%A5%E7%89%A9%E5%9D%97%E5%9C%A8%E6%B0%B4%E5%B9%B3%E6%8E%A8%E5%8A%9BF%E4%BD%9C%E7%94%A8%E4%B8%8B%E6%B2%BF%E7%AB%96%E7%9B%B4%E5%A2%99%E9%9D%A2%E5%8A%A0%E9%80%9F%E4%B8%8B%E6%BB%91%2C%E5%88%99%E7%89%A9%E5%9D%97%E5%8F%97%E5%88%B0%E7%9A%84)
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