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.
c
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