A body of mass $2$ kg is placed on a horizontal surface having kinetic friction $0.4$ and static friction $0.5$ . If the horizontal force applied on the body is $2.5$ N, the frictional force acting on the body will be $(g = 10 m / s^{2})$

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Two bodies having same mass, 2 kg each, have different surface area 50m2 and 100m2 in contact with a horizontal plane. If the coefficient of friction is 0.2, the ratio of frictional forces that come into play when the bodies are in motion, will be:

The correct option is B 1:1Frictional force is independent of the area of contact surfaces.It is the Pressure or Stress which depends upon the surface area.Thus, the forces of friction that come into play when they are in motion, will be in the ratio of 1:1

Two bodies having same mass, $2$ $k g$ each, have different surface area $50 m^{2}$ and $100 m^{2}$ in contact with a horizontal plane. If the coefficient of friction is $0.2$ , the ratio of frictional forces that come into play when the bodies are in motion, will be:

The correct option is B $1 : 1$
Frictional force is independent of the area of contact surfaces.
It is the Pressure or Stress which depends upon the surface area.
Thus, the forces of friction that come into play when they are in motion, will be in the ratio of $1 : 1$