Question

If a box is lying on the floor of a wagon with a coefficient of friction 0.2, what is the maximum acceleration of the wagon for which the box would remain stationary? (Let g = 9.81 m/s^2)

(a) 1.96 m/s^2

(b) 2 m/s^2

(c) 3.92 m/s^2

(d) 4 m/s^2

I have been asked this question by my school principal while I was bunking the class.

My question comes from Friction in portion Work, Energy and Power of Physics – Class 11

Answer 1

The correct option is (a) 1.96 m/s^2

Easiest explanation: Let the mass of the box be “m”

ma = u x mg

a = u x g

a = 0.2 x 9.81

 = 1.96 m/s^2.