Final answer:
To safely brake on a slippery road, press the brakes in slow, steady strokes to control the shift from kinetic to static friction and prevent the car from stopping abruptly.
Step-by-step explanation:
When the road is slippery, the safest way to brake is by pressing your brakes in slow, steady strokes. This method is crucial because of the relationship between static and kinetic friction. When you start to brake, the kinetic friction between the tires and the road allows the car to decelerate. As the car slows down, if you don't ease up on the brake pedal, the sudden shift to static friction may cause the tires to lock, leading to a loss of control. To prevent this, easing up on the brakes as you come to a stop helps maintain a controlled deceleration, reducing the chance of the car stopping abruptly with a jerκ. More friction, like that provided by winter tires on icy roads, is desirable because it enhances grip and safety in adverse conditions.