85.5 applications of Newton's law In 8-F-kAv 人4 g mg -F- kAv kA mg g F I-e 4 du t=0y=0,t个ν个↓, dt t→ov=νm-F =constant --terminal speed 4 85.5 applications of Newtons law Example 2: Block m, in the figure has a mass of 4.20kg and block m, has a mass of 2.30kg. The coefficient of kinetic friction between m and the horizontal plane is 0. 47. The inclined plane is frictionless. Find(a) the acceleration of the blocks and (b) the tension in the string. 2掉11 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − − = = − − − = − − − − t m kA t m kA e kA mg F v e mg F mg F kAv t mg F mg-F-kAv kA m 1 v ln mv o t constant , d d 0 0, max = − →∞ = = = = ↑ ↑ ↓ kA mg F t v v t v t v t v --terminal speed §5.5 applications of Newton’s law §5.5 applications of Newton’s law Example 2: Block m1 in the Figure has a mass of 4.20kg and block m2 has a mass of 2.30kg. The coefficient of kinetic friction between m2 and the horizontal plane is 0.47. The inclined plane is frictionless. Find (a) the acceleration of the blocks and (b) the tension in the string