如图3所示利用弹簧测力计拉着物体在水平面上匀速�右运动该物体受到的�擦力为 N当弹簧测力计的示数增大为4n时该物体受到的�擦力为 N Template




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tomski如图3所示利用弹簧测力计拉着物体在水平面上匀速�右运动该物体受到的�擦力为 n当弹簧测力计的示数增大为4n时该物体受到的�擦力为 n coloring