Question

A body of mass M is kept on a rough horizontal surface (friction coefficient = μ). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on A is F, where
(a) F = Mg
(b) F = μ Mg
(c) Mg ≤ F ≤ Mg √1+μ2
(d) Mg ≥ F ≥ Mg √1-μ2

Answer 1

A body placed in horizontal surface 4 types of force act on a body they are :-

Mg = force due to gravity= weight

N = normal force

uN = force act on a body due to Static friction

F = applying force

since the body doesn't move from one place to another so

N = Mg

and

F = uN

so

F = uMg

option b

Answer 2

A body placed in horizontal surface 4 types of force act on a body they are :-

Mg = force due to gravity= weight

N = normal force

uN = force act on a body due to Static friction

F = applying force

since the body doesn't move from one place to another so

N = Mg

and

F = uN

so

F = uMg

option b