Your body moving forward when you hit the brakes is an example of inertia. Inertia is the tendency of an object to resist changes in its state of motion. Since your body is in motion and the car stops suddenly, your body continues moving forward until the seatbelt exerts a force on you to stop that motion.
While driving you hit the brakes and feel your body move forward before the seatbelt stops you. Your body moving forward is an example of: inertia; balance force; friction; equilibrium
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