A car travels with constant speed on a circular road on level ground. In the diagram above, Fair is the force of air resistance on the car. Which of the other force shown best represents the horizontal force of the road on the car's tires?
A. FA
B. FB
C. FC
D. FD
E. FE
(GR9677 #05)
FA = Centripetal force
FC = Frictional force of the road, equals to force exerted by tires exert in the backward direction so that the car moves in the forward direction (Newton's third law Action-Reaction).
The horizontal force on the car’s tires, FA + FC = FB
Answer: B
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