The coefficient of static friction between the tires of a car and a horizontal road is s=0.56. If the net force on the car is the force of static friction exerted by the road, what is the magnitude of the maximum acceleration of the car when it is braked? I really don't understand what is going on in this question. How can I solve this without the mass, velocity, or acceleration of the car? Why is it talking about static friction instead of kinetic friction if the car is moving? How can the net force be the static friction exerted by the road if the car is moving? vvv Thanks, that's what I needed.