Why is it necessary to wear seat belts when driving a car?

Bodies have the property of inertia.
The inertia of the body is the property of the body to keep its state constant. The more body weight, the more difficult it is to change its state.
When moving, a person moves at the speed of a car. With a sharp braking of the car, the person continues to move by inertia at the speed of the car before braking. This can lead to injuries to a person, by inertia, he can hit the windshield of the car.



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