Question

Consider a vehicle going on a horizontal road towards east. Neglect any force by the air. The frictional forces on the vehicle by the road
(a) is towards east if the vehicle is accelerating
(b) is zero if the vehicle is moving with a uniform velocity
(c) must be towards east
(d) must be towards west

Answer 1

(a) is towards east if the vehicle is accelerating
(b) is zero if the vehicle is moving with a uniform velocity