Q 11-04-009NEETNEET 2023Top questionEasy
Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is $0.15$ ($g = 10\ \text{m s}^{-2}$).
Answer: (C) $1.5\ \text{m s}^{-2}$
Static friction is the only horizontal force on the body, so it must supply $ma$:
$$ma \le \mu_s mg \;\Rightarrow\; a_{max} = \mu_s g = 0.15 \times 10 = 1.5\ \text{m s}^{-2}$$
Solution by Sreeraj P, M.Sc Physics