如圖所示,槓桿處於平衡狀態,如果將物體A和B同時向靠近支點的方向移動相同的距離,下列判斷正確的是(  ) A....

來源:國語幫 9.22K

問題詳情:

如圖所示,槓桿處於平衡狀態,如果將物體A和B同時向靠近支點的方向移動相同的距離,下列判斷正確的是(  )

A. 槓桿仍能平衡 B. 槓桿不能平衡,左端下沉

C. 槓桿不能平衡,右端下沉 D. 無法判斷


如圖所示,槓桿處於平衡狀態,如果將物體A和B同時向靠近支點的方向移動相同的距離,下列判斷正確的是(  ) A....


【回答】

 原來槓桿在水平位置處於平衡狀態,此時作用在槓桿上的力分別為物體A、B的重力,其對應的力臂分別為OC、OD,

根據槓桿的平衡條件可得:mAgOC=mBgOD,由圖示可知,OC<OD.所以mA>mB,

png_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*kSbMocXLz0GO3bskOvXr+v5nzRXf7LtglDwb8uWly9f6gt6//59p8yPpHzMiRMnnLMQqQJT++DBA+fKj6SI2bJli9rgM2fOyNmzZ+XUqVMqR44ckcOHD6twvnfvXjUR9DAjpFgQ7LHxT5RfvnxZrly5IpcuXZJr167p+blz57QNUz/CNS/GwYMH5dChQ2p+qM/dBjac3/Do0SN96Dt37ug0ws2bN7VehHrwlaZOdxtGTp8+LUePHtV2qI/nMfXzXNT36dMn+fjxozx//lzboC3k6tWrKhcuXNC6aMMI1zwvz9+rVy95/Pixo1k/kiIGW9+gQQPp2LGjdO7cWTp16qTJRqRbt27So0cPddx9+/aN2NmBAweqmPNmzZpJ1apVpUaNGjrv0rp1a/0Ox9KlS0vZsmWlcePGmvqnfoS2ENrhaNpB+vXrF9UGQUSrVq2kSZMmWg9HfCL1I5zzOXW56*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

當向支點移動相同的距離△L時,兩邊的力臂都減小△L,此時左邊的力矩為:mAg(OC﹣△L)=mAgOC﹣mAg△L,

右邊的力矩為:mBg(OD﹣△L)=mBgOD﹣mBg△L,由於mA>mB,所以mAg△L>mBg△L;

所以:mAgOC﹣mAg△L<mBgOD﹣mBg△L.

因此槓桿將向懸掛B物體的一端即右端傾斜.

故選C.

知識點:槓桿

題型:選擇題

相關文章
熱門標籤