Question
Physics Question on laws of motion
Consider a vehicle going on a horizontal road towards east. Neglect any force by the air. The frictional force on the vehicle by the road
A
is zero if the vehicle is moving with a uniform velocity
B
is towards east if the vehicle is accelerating
C
must be towards east
D
must be towards west
Answer
is towards east if the vehicle is accelerating
Explanation
Solution
When vehicle is moving with uniform velocity, its acceleration is zero, and external force applied is zero. Therefore, force of friction is zero. When vehicle is accelerating towards east, force exerted by rear wheels on the ground make force of friction acting in the forward direction ie, towards east.