A car travels with constant speed on a circular road on level ground. In the figure shown, Fair is the force of air resistance on the car. Which of the other forces best represent the horizontal force of the road on the car's tyres?
A
FA
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B
FB
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C
FC
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D
FD
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Solution
The correct option is CFB According to the diagram, forces applying on the tyres are FC (friction force ) to move it forward and FA(centripetal force) directed to centre.
By the triangle rule of vectors, resultant force FR on the tyres will be directed in between these two forces FC and FA and we can see FB represent it best.