Final answer:
Emergency stab braking is a technique to stop quickly while maintaining control, involving hard braking and releasing when wheels lock, then reapplying the brakes to ensure wheels keep rolling. It employs Pascal's principle and the relationship between static and kinetic friction. Emergency stab braking is when you:a. Press hard on the brake pedal and apply full pressure on the hand valve until you stop.
Step-by-step explanation:
Emergency stab braking is a method used to stop a vehicle quickly by brake pressure modulation to prevent wheel lockup. This technique is often taught in advanced driving courses and is useful in situations where a driver needs to stop a vehicle in the shortest possible distance while maintaining control. The correct answer to the question is c. Brake as hard as you can, then release the brakes when the wheels lock up and put on the brakes again when the wheels start rolling. Understanding the physics behind braking involves Pascal's principle, which states that pressure applied to a confined fluid is transmitted undiminished in all directions. This is the principle behind hydraulic brake systems in vehicles. When a driver applies a force to the brake pedal, this force is amplified by mechanical leverage and further increased by the hydraulic system, until it is evenly distributed to the brakes at each wheel, allowing for even stopping power. The relationship between static and kinetic friction is also relevant to braking. When a vehicle's wheels lock up, kinetic friction is in play, and this type of friction has a lower coefficient than static friction, leading to less braking force and potential loss of vehicular control. By modulating the brake pressure (stab braking), a driver can keep the wheels at the threshold of locking up, utilizing maximum static friction, which helps in stopping the vehicle more effectively and safely.