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In support of all the students who are displaced from school due to the Corona virus. Access to physics zone and chemistry zone lessons are now available free of charge. This will be maintained at least through August 1st 2020. Learn and be well.

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Passenger Kills Driver and Self when physics goes bad

This clip clearly gives the driver a good reason to make sure occupants in the rear of the car are wearing their seat belts.  Not wearing a seatbelt not only puts your life in danger but also anyone else who happens to be riding with you.  The force from the seatbelt safely decelerates the driver, but the child in the back seat follows Newton's Law of Inertia and continues moving in the absence of a net force.  The 60mph "kid" not only breaks its own neck but also the neck of the driver. 

Crash footage from the National Transportation Safety Board