AIIMS 2018 Physics Kinetic and Static Friction MCQ Question

To determine the maximum static friction force, we use the formula $f_s = \mu_s \cdot N$, where $\mu_s = 0.5$ and $N = mg = 2 \, \text{kg} \times 9.8 \, \text{m/s}^2 = 19.6 \, \text{N}$. Thus, $f_s = 0.5 \times 19.6 \, \text{N} = 9.8 \, \text{N}$. Since option D (2.5 N) is less than the maximum static friction, the body will not move. Options A (8 N), B (10 N), and C (20 N) exceed the static friction limit, causing the body to slide, which is why they are incorrect.