A duster weighs `0.5N`. It is pressed against a vertical board with a horizontal force `11N` If the co-efficient of friction is `0.5` the mimmum force that must be applied on the duster parallel to the board to move it upwards is .

An eraser weighing 2N is pressed against the black board with a force of 5N . The coefficient of friction is 0.4 . How much force parallel to the black board is required to slide the eraser upwards

A block of mass 2 kg is pushed against a rough vertical wall with a force os 40 N. Coefficient of static friction being 05. Another horizontal force is 15 N, is applied on the block in a direction paralle to the wall. Will the block move? If yes in which direction? If no, find the frictional force exerted by the wall on the block.

A block of weight 5N is pushed against a vertical wall by a force 12 N. The coefficient of friction between the wall and block is 0.6. The magnitude of the force exerted by the wall on the block is

A block of weight 5 N is pushed against a vertical wall by a force 12 N . The coefficient of friction between the wall and block is 0.6 . Find the magnitude of the force exerted by the wall on the block :

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 :-

A block of mass 1 kg is held at rest against a rough vertical surface by pushing by a force F horizontally. The coefficient of friction is 0.5. When

A block of mass 4 kg is kept on a rough horizontal surface. The coefficient of static friction is 0.8. If a force of 19 N is applied on the block parallel to the floor, then the force of friction between the block and floor is