(10分)如圖所示,物體A質(zhì)量為2kg,與斜面間摩擦因數(shù)為0.4.若要使A在斜面上靜止,物體B質(zhì)量的最大值和最小值是多少?

 


(10分)

A有向下運(yùn)動(dòng)趨勢(shì)時(shí):

                    (2分)

                                    (2分)

 
代入數(shù)據(jù)得:                       (1分)

A有向上運(yùn)動(dòng)趨勢(shì)時(shí):                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

            (2分)

                            (2分)

 
代入數(shù)據(jù)得:                      (1分)

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