A block of mass m is placed over a rogh surface with coefficents of static and kinetic as `mu_(s) and mu _(k) .` A force F is applied to move block .Surface f is the force of fricty=tion between block and ound . Then chose the wrong opition (s).

A block of mass M is sliding down the plane. Coefficient of static friction is mu_(s) and kinetic friction is mu_(k) . Then friction force acting on the block is :

A block of mass 3kg is placed on a rough horizontal surface (mu_(s)=0.4) . A forc eof 8.7N is applied on th eblock. The force of friction between the block and floor is .

A block of mass m is lying on horizontal surface of coefficient of friction mu. A force is applied to the block at an angle theta with the horizontal. The block will move with a minimum force F if

A block of mass m is lying on horizontal surface of coefficient of friction mu. A force is applied to the block at an angle theta with the horizontal. The block will move with a minimum force F if

A block of mass m is placed on a rough horizontal surface. The coefficent of friction between them is mu . An external horizontal force is applied to the block and its magnitude is gradually increased. The force exerted by the block on the surface is R.

A block of mass m is moving on a rough horizontal surface. mu is the coefficient of kinetic friction between the block and the surface. What is the net force exerted by the surface on the block?