用F拉着200N的物体在水平桌面作匀速直线运动,重物移动的速度为0.3m/s, 弹簧秤示数为40N,求:(1)物体与地面的摩擦力大小?(轮重、轮、绳之间f不计) (2)拉力F大小?(3)若实际拉力为100N,
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![用F拉着200N的物体在水平桌面作匀速直线运动,重物移动的速度为0.3m/s, 弹簧秤示数为40N,求:(1)物体与地面的摩擦力大小?(轮重、轮、绳之间f不计) (2)拉力F大小?(3)若实际拉力为100N,](/uploads/image/z/5028832-64-2.jpg?t=%E7%94%A8F%E6%8B%89%E7%9D%80200N%E7%9A%84%E7%89%A9%E4%BD%93%E5%9C%A8%E6%B0%B4%E5%B9%B3%E6%A1%8C%E9%9D%A2%E4%BD%9C%E5%8C%80%E9%80%9F%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8%2C%E9%87%8D%E7%89%A9%E7%A7%BB%E5%8A%A8%E7%9A%84%E9%80%9F%E5%BA%A6%E4%B8%BA0.3m%2Fs%2C+%E5%BC%B9%E7%B0%A7%E7%A7%A4%E7%A4%BA%E6%95%B0%E4%B8%BA40N%2C%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89%E7%89%A9%E4%BD%93%E4%B8%8E%E5%9C%B0%E9%9D%A2%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B%E5%A4%A7%E5%B0%8F%3F%EF%BC%88%E8%BD%AE%E9%87%8D%E3%80%81%E8%BD%AE%E3%80%81%E7%BB%B3%E4%B9%8B%E9%97%B4f%E4%B8%8D%E8%AE%A1%EF%BC%89+%EF%BC%882%EF%BC%89%E6%8B%89%E5%8A%9BF%E5%A4%A7%E5%B0%8F%3F%EF%BC%883%EF%BC%89%E8%8B%A5%E5%AE%9E%E9%99%85%E6%8B%89%E5%8A%9B%E4%B8%BA100N%2C)
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