Friction #!#Part 2#!#Minimum Force required to move a block on a horizontal surface

The minimum force required just to move a block on a rough horizontal surface is 5N The block fails to move when a force of 3N is applied on it Static frition is .

The minimum force required just to move a block on a rough horizontal surface is 10 N An applied force of 5 N fails to move the block. What are the values of static friction and dynamic friction ?

A block of mass 2 kg is kept on a rough horizontal floor an pulled with a force F. If the coefficient of friction is 0.5. then the minimum force required to move the block is :-

If a pushing force making an angle alpha with horizontal is applied on a block of mass m placed on horizontal table and angle of friction is beta , then minimum magnitude of force required to move the block is

A man wants to slide down a block of mass m which is kept on a fixed inclined plane of inclination 30^(@) as shown in the figure .Initially the block is not sliding . To just start sliding the man pushed the block down the inclined with a force F . Now , the block starts accelerating. To move it downwards with conatant speed the man starts pulling the block with same force. Surface are such that ratio of maximum static friction to kinetic friction is 2 Now, answer the following questions. What minimum force is required to move it up the incline with constant speed?

A block of mass m=1/3 kg is kept on a rough horizontal plane. Friction coefficient is mu=0.75 . The work done by minimum force required to drag to the block along the plane by a distance 5m is :-

A boy of mass 50 kg produces an acceleration of 2(m)/(s^2) in a block of mass 20 kg by pushing it in horizontal direction. The boy moves with the block such that boy and the block have same acceleration. There is no friction between the block and fixed horizontal surface but there is friction between foot of the boy and horizontal surface. Find friction force (in Newton) exerted by the horizontal surface on the boy.