Question

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

• A. 1 : 1
• B. 1 : 2
• C. 2 : 1
• D. 1 : 4

Answer 1

The correct option is A 1 : 1

Force of friction is same in both cases. As frictional force is independent of the surface in contact with ground and depends only on mass of the body.
$\therefore$ Force is same for all surfaces.
$\therefore$ Ratio of forces of friction is 1 : 1.