Q.

A car travels with constant speed on a circular road on level ground. In figure, Fair. is the force of air resistance on the car. Air resistance acts opposite to the motion of car. Which of the other forces shown best represents the horizontal force of the road on the car's tires?
 

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a

FA

b

FB

c

FD

d

FC

answer is D.

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Detailed Solution

As car travels with constant speed. The net force on the car should be towards the centre. The resultant of Fair and FB may towards the centre. 

FB is the resultant force of normal force and friction force by the road.

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A car travels with constant speed on a circular road on level ground. In figure, Fair. is the force of air resistance on the car. Air resistance acts opposite to the motion of car. Which of the other forces shown best represents the horizontal force of the road on the car's tires?