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The passengers notice this [[acceleration]] because it feels as if a [[force]] is acting on them:
#When the car slows down for the roundabout the passengers feel the [[force]] of the seatbelt [[Deceleration|decelerating]] them.
#When the car speeds up the passengers feel the [[force]] of the back of the chair [['''accelerating]] ''' them.
#When the car turns quickly the passengers feel the [[force]] of the side door changing their direction.
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