Question

A car travels with constant speed on a circular road on level ground. In the figure shown, $F_{air}$ 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. $F_A$
• B. $F_B$
• C. $F_C$
• D. $F_D$

Answer 1

Answer: (B)

$F_B$

According to the diagram, forces applying on the tyres are $F_C$ (friction force ) to move it forward and $F_A$(centripetal force) directed to centre.

By the triangle rule of vectors, resultant force $F_R$ on the tyres will be directed in between these two forces $F_C$ and $F_A$ and we can see $F_B$ represent it best.