如图所示,不计滑轮质量及转动摩擦,当水平拉力F=30N时,物体m恰能沿水平作匀速运动.则地面对物体m的阻力f大小是( )A.15N B.30N C.60N D.无法判断 答案为什么是A,既然是动滑
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![如图所示,不计滑轮质量及转动摩擦,当水平拉力F=30N时,物体m恰能沿水平作匀速运动.则地面对物体m的阻力f大小是( )A.15N B.30N C.60N D.无法判断 答案为什么是A,既然是动滑](/uploads/image/z/10004556-12-6.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%B8%8D%E8%AE%A1%E6%BB%91%E8%BD%AE%E8%B4%A8%E9%87%8F%E5%8F%8A%E8%BD%AC%E5%8A%A8%E6%91%A9%E6%93%A6%2C%E5%BD%93%E6%B0%B4%E5%B9%B3%E6%8B%89%E5%8A%9BF%3D30N%E6%97%B6%2C%E7%89%A9%E4%BD%93m%E6%81%B0%E8%83%BD%E6%B2%BF%E6%B0%B4%E5%B9%B3%E4%BD%9C%E5%8C%80%E9%80%9F%E8%BF%90%E5%8A%A8%EF%BC%8E%E5%88%99%E5%9C%B0%E9%9D%A2%E5%AF%B9%E7%89%A9%E4%BD%93m%E7%9A%84%E9%98%BB%E5%8A%9Bf%E5%A4%A7%E5%B0%8F%E6%98%AF%EF%BC%88%E3%80%80%E3%80%80%EF%BC%89A%EF%BC%8E15N++++B%EF%BC%8E30N++++C%EF%BC%8E60N++++D%EF%BC%8E%E6%97%A0%E6%B3%95%E5%88%A4%E6%96%AD++++%E7%AD%94%E6%A1%88%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AFA%2C%E6%97%A2%E7%84%B6%E6%98%AF%E5%8A%A8%E6%BB%91)
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