Question

When a running car stops suddenly, why does the passenger tends to lean forward?

Answer 1

This happens because of inertia of motion.

Answer 2

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When a running car stops suddenly, the passenger tends to lean forward because of Law of Inertia of Motion. According to Newton's 1st law of motion, every bodies have nature to maintain inertia of rest or motion until there is no net force applied on that body.

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