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

Question

Philoid · Accepted Answer

Mass of the body= m

Weight of the body= normal force on the body= mg

Friction coefficient = μ

If the person is pulling the body by force P, then

Force by the surface on the body is given by

For maximum F,

So,

(i)

Now, F= mg sec θ

As we know, sec θ ≥ 1

This implies, F ≥ mg

Or mg F (ii)

Combining (i) and (ii) we get,

mgF