Two blocks of mass `10 kg` and `30 kg` are kept as shown in the figure. The surface between the block is fricitional while the ground is smooth. A horizontal force of magnitude `60 N` is applied horizontally on the upper block. Find the frictional force on block of mass `30 kg` ?

Two blocks of masses 4 kg and 6 kg are kept on a rough horizontal surface as shown. If the acceleration of 6 kg block is 5n , then n is :

Two blocks of masses 4 kg and 6 kg are kept on a rough horizontal surface as shown. If the acceleration of 6 kg block is 5n , then n is :

If the mass of block is 1 kg and a force of 10 / sqrt3 N is applied horizontally on the block as shown in the figure . The frictional force acting on the block is :

Two blocks of masses 2 kg and 4 kg are kept on a frictionless and smooth inclined plane. The angle of inclination with horizontal is 30^(@) . A force of 60 N is applied parallel to the plane in upward direction. Find out the normal force in between two blocks.

A block A of mass 4 kg is kept on ground. The coefficient of friction between the block and the ground is 0.8 . The exernal force of magnitude 30 N is applied applied parallel to the ground. The resultant force exernal by the ground on the block is (g = 10 m//s^(2))

A plank of mass 10 kg and a block of mass 2 kg are placed on a horizontal plane as shown in the figure. There is no friction between plane and plank. The coefficient of friction between block and plank is 0.5 .A force of 60 N is applied on plank horizontally. In first 2 s the work done by friction on the block is

A plank of mass 10 kg and a block of mass 2 kg are placed on a horizontal plane as shown in the figure. There is no friction between plane and plank. The coefficient of friction between block and plank is 0.5 .A force of 60 N is applied on plank horizontally. In first 2 s the work done by friction on the block is

A small block of mass 20kg rests on a bigger block of mass 30kg , which lies on a smooth horizontal plane. Initially the whole system is at rest. The coefficient of friction between the blocks is 0.5 . The horizontal force F=50N is applied on the lower block. a. Find the work done by fricitonal force on upper block and on the lower block in t=2s . b. Is the magnitude of work done by the frictional force on upper and lower blocks same? c. Is the work done by the frictional force on the upper block converted to heat or mechanical energy or both?

A small block of mass 20kg rests on a bigger block of mass 30kg , which lies on a smooth horizontal plane. Initially the whole system is at rest. The coefficient of friction between the blocks is 0.5 . The horizontal force F=50N is applied on the lower block. a. Find the work done by fricitonal force on upper block and on the lower block in t=2s . b. Is the magnitude of work done by the frictional force on upper and lower blocks same? c. Is the work done by the frictional force on the upper block converted to heat or mechanical energy or both?