Final answer:
Wearing a seat belt is a good idea because of Newton's 1st Law of Motion. According to this law, an object at rest will stay at rest and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an external force.
Step-by-step explanation:
Wearing a seat belt is a good idea because of Newton's 1st Law of Motion. According to this law, an object at rest will stay at rest and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an external force. When a car suddenly stops, the passengers inside it tend to continue moving forward due to their inertia. Without a seat belt, they would be thrown forward, potentially causing injury or death. The seat belt exerts a force on the passenger, essentially slowing them down and preventing them from moving forward.
Learn more about Newton's 1st Law of Motion