11．在“探究力的平行四边形定则 的实验情况如图7甲所示其中a为固定橡皮筋的图钉0为橡皮筋与细绳的结点ob和oc为细绳图7乙是在白纸上 Sketch Coloring Page

11．在“探究力的平行四边形定则 的实验情况如图7甲所示其中a为固定橡皮筋的图钉0为橡皮筋与细绳的结点ob和oc为细绳图7乙是在白纸上 Template

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tomski11．在“探究力的平行四边形定则 的实验情况如图7甲所示其中a为固定橡皮筋的图钉0为橡皮筋与细绳的结点ob和oc为细绳图7乙是在白纸上 coloring

14．在“验证力的平行四边形定则 实验中根据的是合力与分力的等效替代原理 1要使每次合力与分力产生相同的效果必须 A．每次将橡皮条拉 sketch template

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某同学用图1的装置验证力的平行四边形定则实验记录纸如图3所示主要操作如下�用两弹簧测力计共同拉橡皮筋当结点被拉到图中O点时记下拉力 sketch template

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如图所示在做“探究力的平行四边形定则 的实验时用MN两个测力计通过细线拉橡皮条的结点使其到达O点此时α β=90°然后保持M的示数 sketch template

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如图所示在做“探究力的平行四边形定则 的实验时用MN两个测力计通过细线拉橡皮条的结点使其到达O点此时α β=90°然后保持M的示数 sketch template

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