TA-f -mgsin30=ma 48c0S30 =0 fr=urm g cos 30 fr +m, T=u,mAg cos30+m4gsin 30+ ma mrg-TR=mgo B T B B B T=T B 2006-2-23
2006-2-23 16 cos 30 0 0 N − mA g = 0 f m g cos 30 k = µ k A T m g m g m a ∴ A = k A + A + A 0 0 µ cos30 sin30 T f m g m a A − k − A = A 0 sin30 A N v TA v k f v m gA v a v B m gB v TB v a v mB g −TB = mBa T m ( g a) B = B − Q TA = TB
T=uMaG COS 30 +mAg sin 30+ma A B B ) mg-um cos 30-m, sin 30 g M4+m1 B T=TR=mB(g-a m mg(1+ ucos 30+ sin 30) n1+m1 B a=0.75m/s2T=T=181N 2006-2-23
2006-2-23 17 TA = kmA g + mA g + mAa 0 0 µ cos 30 sin 30 T T m (g a) A = B = B − g m m m m m a A B B A A + − − = 0 0 µ cos30 sin30 TA = TB m ( g a) = B − g m m m m A B A B + + + = (1 cos 30 sin 30 ) 0 0 µ 2 ∴ a = 0.75m s TA =TB =1.81N