As a car goes up a hill,there is a force of friction between the road and the tires rolling on the road.The maximum force of friction is equal to:
A)the weight of the car times the coefficient of kinetic friction.
B)the normal force of the road times the coefficient of kinetic friction.
C)the normal force of the road times the coefficient of static friction.
D)zero.

Question

Quizplus · Accepted Answer

The maximum force of friction is given by the product of the coefficient of static friction and the normal force of the road. This is because when the car is moving up the hill, it is not in a state of constant motion, but rather a state of equilibrium, hence static friction comes into play. The weight of the car does not directly affect the maximum force of friction, although it does affect the normal force of the road. Also, kinetic friction only applies once the car is already in motion, not when it is trying to overcome static friction to start moving.

As a Car Goes Up a Hill,there Is a Force