Question

在“探究加速度與力、質(zhì)量的關(guān)系”的實(shí)驗(yàn)中，采用如圖1所示的裝置．                        

                              

（1）下列說法中正確的是                                                                                    

A．在探究加速度與質(zhì)量的關(guān)系時(shí)，應(yīng)改變拉力的大小                                                 

B．在探究加速度與外力的關(guān)系時(shí)，應(yīng)該改變小車的質(zhì)量                                              

C．在探究加速度a與質(zhì)量m的關(guān)系時(shí)，為了直觀判斷二者間的關(guān)系，應(yīng)作出a﹣圖象                           

D．當(dāng)小車的質(zhì)量遠(yuǎn)小于砝碼盤和砝碼的總質(zhì)量時(shí)，才能近似認(rèn)為細(xì)線對(duì)小車的拉力大小等于砝碼盤和砝碼的總重力大小                                                                                                                               

（2）某同學(xué)測(cè)得小車的加速度a和拉力F的數(shù)據(jù)如下表所示：（小車質(zhì)量保持不變）根據(jù)表中的數(shù)據(jù)在坐標(biāo)圖上如圖2作出a﹣F圖象．                                                                                                                  

F/N       0.20    0.30    0.40    0.50    0.60

a/m•s^﹣2 0.10    0.23    0.27    0.40    0.49

（3）該圖線不通過坐標(biāo)原點(diǎn)的原因可能是                                                                    ．          

                                                                                                                                    

Answer 1

（1）C，（2）如圖所示，（3）沒有平衡摩擦力或平衡摩擦力時(shí)木板傾角太�。�