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Question
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.
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.
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Solution
The correct options are
A is towards east when vehicle is accelerating
B is zero when vehicle is moving with uniform velocity
The vehicle moves on the rod by pushing the ground in backward direction, i.e., by trying to slip against the ground in backward direction. So the ground in-turn apply friction on its wheels in forward direction.
When vehicle moves with uniform velocity, the net force on the vehicle in horizontal direction is zero. So frictional force by road is zero. Whereas, when it accelerates, the frictional force would be in forward direction, i.e., in the direction of its acceleration. So option A and B are correct.
A is towards east when vehicle is accelerating
B is zero when vehicle is moving with uniform velocity
The vehicle moves on the rod by pushing the ground in backward direction, i.e., by trying to slip against the ground in backward direction. So the ground in-turn apply friction on its wheels in forward direction.
When vehicle moves with uniform velocity, the net force on the vehicle in horizontal direction is zero. So frictional force by road is zero. Whereas, when it accelerates, the frictional force would be in forward direction, i.e., in the direction of its acceleration. So option A and B are correct.
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