EFJ

EFJ stands for "Effective Frontal Jerk," a term used primarily in automotive safety and crash analysis. It measures the rapid acceleration or deceleration experienced by a vehicle's front end during a collision. Essentially, EFJ helps assess how forcefully the vehicle's front moves or stops, which impacts the severity of injuries to occupants and the damage caused. By analyzing EFJ, engineers can improve vehicle designs for better safety performance, ensuring that forces are managed effectively to reduce injury risk during accidents.