Why does stopping a vehicle you’re in cause you to jerk forward, even though motion is supposed to be relative (and the vehicle isn’t moving from your “physics” perspective)?
In: Physics
The inertia of you is the same as the inertia of the car. So when you decelerate your body still wants to go the speed you were going before braking. So if the car was going 80mph(100kph) and you slowed down, your body will have a negative g response pressing into the seatbelt as your forward inertia dissipates.
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