When a car goes around a circular curve on a level road without slipping,
A) no frictional force is needed because the car simply follows the road.
B) the frictional force of the road on the car increases when the car's speed decreases.
C) the frictional force of the road on the car increases when the car's speed increases.
D) the frictional force of the road on the car increases when the car moves to the outside of the curve.
E) there is no net frictional force because the road and the car exert equal and opposite forces on each other.

Question

Quizplus · Accepted Answer

When a car goes around a circular curve on a level road without slipping, the frictional force of the road on the car increases when the car's speed increases. This is because the centripetal force required to keep the car moving in a circle increases with speed, and friction provides the necessary force for the car to maintain its circular path. The frictional force is proportional to the normal force between the tires and the road, which is the weight of the car in this case. Therefore, the frictional force increases with the weight of the car and the speed at which it is traveling.

When a Car Goes Around a Circular Curve on a Level