Question

FIGURE 1 shows a uniform ladder PQ of weight 240 N leans on a smooth wall and resting on a rough floor with a minimum inclination angle θmin. The coefficient of friction between the ladder and floor is 0.25. (i) With the aid of a force diagram, calculate the forces acting on the ladder at point P and point Q.(ii) Determine the value of θmin.

Answer 1

The weight of the ladder is,

`W=240\text{ N}`

The coefficient of friction is,

`\mu=0.25`

The normal force on the ladder due to the floor is,