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F.N1>F.N2,弹簧长度将变长 F.N1>F.N2,弹簧长度将变短 F.N1N2,弹簧长度将变长 F.N1N2,弹簧长度将变短
(F/P,il,n1)<(F /P,i2,n2) (F/P, i1, n2)=(F /P,i2,n2) (F/P,i l,nl)>(F /P,i2,n2) 不能确定 (F/ P,i1,n1)与(F/P,i2,n2)的大小
(F/P,i1,n1)<( F/P,i2,n2) (F/P,i1,n2)=( F/P,i2,n2) ( F/P,i1,n1)>(F/P,i2,n2) 不能确定( F/P,i1,n1 )与( F/P,i2,n2)的大小
FN1>FN2>FN3 FN2>FN3>FN1 FN3>FN1>FN2 FN3N1N2
(F/A,i,n)=(F/P,i,n)×(P/A,i,n) (F/P,i,n)=(F/P,i,n1)×(F/P,i,n2),其中:n1+n2=n (F/P,i,n)=(F/P,i,n1)+(F/P,i,n2),其中:n1+n2=n (P/A,i,n)=(P/F,i,n)/(A/F,i,n)
FN1拉力、FN2拉力 FN1压力、FN2拉力 FN1·FN2<0 FN1= FN2=0
FN1<FN0=W<FN2 FN1>FN0=W>FN2 FN1=FN0=W=FN2 FN1=FN2=<FN0=W
F.N1>F.N2,弹簧长度将变长 F.N1>F.N2,弹簧长度将变短 F.N1N2,弹簧长度将变长 F.N1N2,弹簧长度将变短
FN1拉力、FN2拉力 FN1压力、FN2拉力 FN1·FN2<0 FN1=FN2=0
沿斜面下滑,恰能匀速.后给A.一个沿斜面向下的力F.,让其加速下滑.设前后两次A.与斜面间的摩擦力分别为Ff1、Ff2,地面对斜面的支持力分别为F.N1、F.N2,则 ( ) A.Ff1=Ff2,F.N1=FN2 Ff1=Ff2,F.N1>F.N2 Ff1<Ff2,F.N1<F.N2 Ff1>Ff2,F.N1>F.N2
FN1<FN0=W<FN2 FN1>FN0=W>FN2 FN1=FN0=W=FN2 FN1=FN2=<FN0=W
FN1拉力、FN2拉力 FN1压力、FN2拉力 FN1·FN2<0 FN1=FN2=0
FN1拉力、FN2拉力 FN1压力、FN2拉力 FN1˙FN2<0 FN1=FN2=0
(F/A,i,n)=(F/P,i,n)×(P/A,i,n) (F/P,i,n)=(F/P,i,n1)×(F/P,i,n2)其中n1+n2=n (P/F,i,n)=(P/F,i,n1)+(P/F,i,n2)其中n1+n2=n (P/A,i.n)=(P/F,i,n)/(A/F,i,n) 1/(F/A,i,n)=(A/F,i,n)
FN1>FN2,弹簧长度将变长 FN1>FN2,弹簧长度将变短 FN1N2,弹簧长度将变长 FN1N2,弹簧长度将变短
F.N1始终减小,F.N2始终增大 F.N1始终减小,F.N2始终减小 F.N1先增大后减小,F.N2始终减小 F.N1先增大后减小,F.N2先减小后增大
F1>F2>F3,FN1=FN2=FN3 F123,FN1N2N3 F1=F2=F3,FN1>FN2>FN3 F1=F2=F3,FN1=FN2=FN3