A ladder AB is spported by a smooth vertical wall ad rough horizontal floor as shown. A boy tarts moving from A to B slowly. The ladder remains at rest, then pick up the correct statements (s):

Options

A. Magnitude of normal reaction by wall on ladder will increase
B. magnitude of normal reaction by wall on ladder will decrease
C. magnitude of normal reaction by floor on ladder will remain unchanged
D. magnitude of friction force by floor on ladder at will increase.

Answer

A, C, D

Explanation

Let m and `M` be mass of man and ladder. From FBD normal reaction at `A` is `N_(1)=(m+M)g` which remains constant net
Torwue on man `+` ladder is zero about B. if x decreases then torque of mg about B will decrease. Hence `f` must increase