Final answer:
When you come to a stop in a car, keeping your foot on the brake pedal helps with the smooth transition from static to kinetic friction, preventing the car from je-rking forward.
Step-by-step explanation:
When you come to a stop, you need to keep your foot on the brake pedal to prevent the car from je-rking forward. This is due to the relationship between static and kinetic friction. Static friction is the force that keeps an object at rest, while kinetic friction is the force that acts on an object in motion.
When you press the brake pedal, static friction between the brake pads and the rotor or drum prevents the wheels from rotating. As the car comes to a stop, this static friction gradually transitions into kinetic friction, which allows the car to slow down. If you release the brake pedal abruptly, the transition from static to kinetic friction happens suddenly, causing a je-rk.
By gradually releasing the brake pedal as you come to a stop, you allow the friction forces to transition smoothly, preventing the car from je-rking forward.