Static and Kinetic Friction

A block of mass 5 kg is lying on a rough horizontal surface. The coefficient of static and Kinetic friction are 0.3 and 0.1 and g=10m//s^(-2) If a horizontal force of 50N is applied on the block, the frictional force is

Block A mass 6 kg and block Z are attached to a rope which passes over a pulley A foce p=50N is applied horizontally to block A , Keeping it in contact with a rough vertical face The coeffcients of static and Kinetic friction is on the verge of slipping upward .THe mass of mass of block X is alpha kg Find alpha

A block of mass 2 kg is pressed against a rigid vertical wall by a horizontal force of 100 N. If co-efficient of static and kinetic friction are each equal to 0.3 then find the magnitude and direction of frictional force on the block.

A body of mass 60 kg is dragged with just enough force to start moving on a rough surface with coefficient of static and kinetic frictions 0.5 and 0.4 respectively . On applying the same force , what is the acceleration ?

A uniform disc of mass m and radius R is rolling up a rough inclined plane which makes an angle of 30^@ with the horizontal. If the coefficients of static and kinetic friction are each equal to mu and the only force acting are gravitational and frictional, then the magnitude of the frictional force acting on the disc is and its direction is .(write up or down) the inclined plane.

A wooden block is kept n a polished woden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the pland makes an angle of 18^@ with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15^@ . Find the coefficients of static and kinetic friction between the block and the plank.