Question

A body of mass 2kg is placed on a rough horizontal plane. The coefficient of friction between body and the plane is 0.2. Then ___________

(a) Body will move in forward direction if F=3N

(b) Body will move in backward direction with acceleration of 0.5m/s^2, if force F=3N

(c) If F=3N, then body will be in rest condition

(d) The body will move both in forward during a particular period and then remain at rest

I got this question in final exam.

Asked question is from Forces and Inertia in portion Gravitation of Engineering Physics I

Answer 1

The correct choice is (d) The body will move both in forward during a particular period and then remain at rest

The explanation: Limiting friction, f = μR = μmg = 0.2×2×9.8=3.92N

When F>3.92N the body will move in a forward direction. When F=3N, the body will move to remain at rest.