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er li de he cheng yan shi shi yan de gai jin
Pages: 30
Year: Issue:  3
Journal: Experiment and Equipment for Primary School

Abstract:  二力的合成演示实验无论用教材上的一套器材还是用J04052力的合成分解演示仪(在引力器挂着下端系着绳子的橡皮筋),都需让一同学先用钩码沿水平或竖直方向拉绳子,将橡皮筋伸长到一定长度,再用钩码以一定角度沿两边拉绳子,将橡皮筋仍伸长到相同的长度.而另一同学帮忙用粉笔打点,做好标记.最后,把两点联成一条线,得到二个分力和合力的方向,根据记录的力的大小和力的图示法画出三个力的图示,再用四边形法则验证二力...
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