Question

A rod $AB$ rests with the end $A$ on rough horizontal ground such that end A is prevented from sliding to the right. And the end 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 $A$ and $B$ is taken perpendicular to the wall/ground and pushing outwards. Forces at $A$ and $B$ are shown in the figure. Note that the force $\left(f_A\right)$ at $A$ is the left as this point tends to move to the right.