Question

A rod $\text{AB}$ rests with the end $\text{A}$ on rough horizontal ground such that end $\text{A}$ is prevented from sliding to the right. And the end $\text{B}$ against a smooth vertical wall. The rod is uniform and of weight $W$. If the rod is in a stationary position as shown in figure, the number of forces acting in the FBD of rod is/are ?

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is D $4$


The direction of normal reaction at points $\text{A}$ and $\text{B}$ is taken perpendicular to the wall/ground and pushing outwards. Forces at $\text{A}$ and $\text{B}$ are shown in the figure. Note that the force $\left(f_A\right)$ at $\text{A}$ is the left as this point tends to move to the right.