18.如图所示,用F=20牛的力把重力为8牛的物体紧紧地压在竖直的墙上,第一次静止,第二次匀速下滑.物体受到的摩擦力大小分别f 1和f 2,那么f 1和f 2的值分别为: ( )A. 8牛,8
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![18.如图所示,用F=20牛的力把重力为8牛的物体紧紧地压在竖直的墙上,第一次静止,第二次匀速下滑.物体受到的摩擦力大小分别f 1和f 2,那么f 1和f 2的值分别为: ( )A. 8牛,8](/uploads/image/z/3333602-2-2.jpg?t=18.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%A8F%EF%BC%9D20%E7%89%9B%E7%9A%84%E5%8A%9B%E6%8A%8A%E9%87%8D%E5%8A%9B%E4%B8%BA8%E7%89%9B%E7%9A%84%E7%89%A9%E4%BD%93%E7%B4%A7%E7%B4%A7%E5%9C%B0%E5%8E%8B%E5%9C%A8%E7%AB%96%E7%9B%B4%E7%9A%84%E5%A2%99%E4%B8%8A%2C%E7%AC%AC%E4%B8%80%E6%AC%A1%E9%9D%99%E6%AD%A2%2C%E7%AC%AC%E4%BA%8C%E6%AC%A1%E5%8C%80%E9%80%9F%E4%B8%8B%E6%BB%91.%E7%89%A9%E4%BD%93%E5%8F%97%E5%88%B0%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B%E5%A4%A7%E5%B0%8F%E5%88%86%E5%88%ABf+1%E5%92%8Cf+2%2C%E9%82%A3%E4%B9%88f+1%E5%92%8Cf+2%E7%9A%84%E5%80%BC%E5%88%86%E5%88%AB%E4%B8%BA%3A+++++++++++++++++++++++++++%28+++++++%29A.+8%E7%89%9B%2C8)
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