如图为“用DIS(位移传感器、数据采集器、计算机)研究加速度和力

如图为“用DIS(位移传感器、数据采集器、计算机)研究加速度和力的关系”的实验装置。

1.在该实验中必须采用控制变量法,应保持___________不变,用钩码所受的重力作为_________,用DIS测小车的加速度。

2.改变所挂钩码的数量,多次重复测量。在某次实验中根据测得的多组数据可画出a-F关系图线(如图所示)。

①分析此图线的OA段可得出的实验结论是___________________                            __。

②(单选题)此图线的AB段明显偏离直线,造成此误差的主要原因是(     )

A.小车与轨道之间存在摩擦  

B.导轨保持了水平状态

C.所挂钩码的总质量太大

D.所用小车的质量太大

 

答案

 

1.)小车的质量   小车的合力

2.小车的加速度与其合力成正比……2分

2C……2分

解析:略

 

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