Question

如图1所示为某同学所安装的“验证牛顿第二定律”的实验装置．若测得某一物体质量m一定时，a与F的有关数据资料如下表所示：                                                                                                                  

a/（m•s^﹣2）      1.98       4.06       5.95       8.12

F/N                   1.00       2.00       3.00       4.00

            

（1）根据表中的数据，请在图2中画出a﹣F图象．                                                

（2）根据图象判定：当m一定时，a与F的关系为                                            

（3）若甲、乙两同学在实验过程中由于没有按照正确步骤进行实验，处理数据后得出如图3所示的a﹣F图象．          

试分析甲、乙两同学可能存在的问题：                                                                     

甲：                                                                                                                   

乙：                                                                                                                   

                                                                                                                                

Answer 1

（1）如图

（2）a与F成正比

（3）平衡摩擦力时把长木板抬得过高，没有平衡摩擦力或平衡摩擦力不足．