Question

Two blocks of masses m and M are connected by a string and pass over a frictionless pulley. Mass m hangs vertically, and mass M moves on an inclined plane that makes an angle θ with the horizontal. Draw a sketch, and if the coefficient of kinetic friction is μk,calculate the angle θ for which the blocks move with uniform velocity. Discuss the special case when m = M

Answer 1

`sin\theta - \mu_k cos\theta = (m)/(M)`

`sin\theta - \mu_k cos\theta = 1`

Step-by-step explanation:

Force of friction on M mass so that it will move down the inclined plane is given as

`F_f = \mu Mgcos\theta`

now if it is moving down the inclined plane at constant speed

so we will have

`Mgsin\theta - T - \mu mgcos\theta = 0`

on other side the mass "m" will go up at constant speed

so we have

`T - mg = 0`

so we have

`Mgsin\theta = \mu Mgcos\theta + mg`

so we have

`sin\theta - \mu_k cos\theta = (m)/(M)`

for special case when m = M

then we have

`sin\theta - \mu_k cos\theta = 1`