For two bodies A and B of same material held on a horizontal plane force of limitting friction F varsus normal reaction R graphs are as shown in Which one has smoother surface in contact with the plane . .

For two bodies A and B of same material held on a horizontal plane for

1.	For two bodies A and B of same material held on a horizontal plane force of limitting friction F varsus normal reaction R graphs are as shown in Which one has smoother surface in contact with the plane . .
Answer» `A` `B` Both A and B Neither A nor B Solution :As `mu = F//R =` slope of F -R curve which is greater for A THEREFORE for BODY A force of frictionis SMALLER. `:.` Surface of body B in contact with the plane must be smoother