Question

如圖1所示為某同學所安裝的“驗證牛頓第二定律”的實驗裝置．若測得某一物體質(zhì)量m一定時，a與F的有關數(shù)據(jù)資料如下表所示：                                                                                                                  

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

F/N                   1.00       2.00       3.00       4.00

            

（1）根據(jù)表中的數(shù)據(jù)，請在圖2中畫出a﹣F圖象．                                                

（2）根據(jù)圖象判定：當m一定時，a與F的關系為                                            

（3）若甲、乙兩同學在實驗過程中由于沒有按照正確步驟進行實驗，處理數(shù)據(jù)后得出如圖3所示的a﹣F圖象．          

試分析甲、乙兩同學可能存在的問題：                                                                     

甲：                                                                                                                   

乙：                                                                                                                   

                                                                                                                                

Answer 1

（1）如圖

（2）a與F成正比

（3）平衡摩擦力時把長木板抬得過高，沒有平衡摩擦力或平衡摩擦力不足．