Final answer:
Newton's first law of motion, or the law of inertia, explains the importance of seatbelts in cars by highlighting how they prevent passengers from moving with the car's sudden changes in motion.
Explanation:
Newton's first law of motion, also known as the law of inertia, explains why using a seatbelt in a car is a good idea. According to this law, an object in motion tends to stay in motion unless acted on by an external force. Therefore, in a car crash or sudden stop, the seatbelt applies an external force that helps restrain the passengers, preventing them from moving with the car's abrupt change in motion.
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