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4. Physics and Natural Laws

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5. Wearing Seat Belts - Wrong

The pictures to the right show common ways that people tend to wear their seat belts. These three are the wrong way, and can cause injuries!

In the left example, the seat belt has been placed behind the shoulder. It now rests on the bottom, "floating" ribs. This is more common with women. In a collision, the body would tend to bend at the waist lap belt, and all the inertia forces would be focused on these ribs, breaking them and/or pushing them into the chest cavity where the lungs and other vital organs can be punctured.

In the middle example, the belt is too loose. This will allow the body to move forward, at the speed of the vehicle, and then suddenly being stopped by the belt snapping against the breast bone.

In the right example, the belt is twisted, producing a much smaller contact area withe the breast bone. The forces will be focused on this area and, much like a hammer, exerts a large force on a small area (like the difference between a slap and a punch).


Click on pictures to see full-size image

What are the wrong ways to wear a seat belt?


Lesson Summary


  

Lesson 4 Quiz


You will now answer 5 questions to test what you learned during this lesson. You must answer all questions correctly to receive completion credit for this lesson. You may answer the questions as many times as necessary to get them right.

You should review the lesson material if you don't do well on the quiz.

  1. According to the formula for stopping distance, how many feet will it take you to stop, from 60 mph?


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  2. The primary factor in decreasing the Kinetic Energy of an object is to:


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  3. The best way to maximize the traction of your tires is to:


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  4. Gravity:


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  5. Centrifugal force:


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