试题与答案

取一只小塑料袋（重力忽略不计），袋内装满水，用细线把袋口扎紧（要求袋内不留空气）

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题型：填空题

题目：

取一只小塑料袋（重力忽略不计），袋内装满水，用细线把袋口扎紧（要求袋内不留空气），然后用弹簧测力计将它吊起，称出水所受的重力。将这袋水逐渐浸入水中，弹簧测力计读数逐渐变小，表明水袋所受浮力的大小随排开水的体积增大而___________。当水袋全部浸没水中时，弹簧测力计的读数为零，说明这时水袋所受浮力等于_____________。

答案：

不变；袋内水的重力（或水袋排开水的重力）

考点：浮力及阿基米德原理
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