85.5 applications of Newton's law T fr=urN WI=mg W2=m280=27 ,gsin 0-T=m,a T-A,N N,-m,gcos00[ N2-m28=0 85.5 applications of Newtons law Exercise 1: As shown in figure the block b weighs 94kg and block a weighs 29 kg. between block b and the plane the coefficient of static friction is 0.56 and the coefficient of the kinetic friction is 0. 25(a) find the acceleration if b is moving up the plane. (b)what is the 42 acceleration if b is moving down the plane?12 §5.5 applications of Newton’s law o r r 27 1 2 2 1 2 = = = = = = θ µ a a a f N T T T x x k k N2 r W m g r r 2 = 2 T2 r k f r θ N1 r W m g r r 1 = 1 T1 r θ x y x y ⎩ ⎨ ⎧ − = − = cos 0 sin 1 1 1 1 θ θ N m g m g T m a ⎩ ⎨ ⎧ − = − = 0 2 2 2 2 N m g T N m a µ k Exercise 1 : As shown in figure, the block B weighs 94kg and block A weighs 29 kg. Between block B and the plane the coefficient of static friction is 0.56 and the coefficient of the kinetic friction is 0.25. (a) find the acceleration if B is moving up the plane. (b) what is the acceleration if B is moving down the plane? o 42 A B §5.5 applications of Newton’s law