What phisics control car seat design?

Question

What phisics control car seat design?

Answer 1

Check the national highway traffic and safety administration site.

http://www.nhtsa.dot.gov/

Answer 2

Car seats have to meet minimum DOT standards for crash protection.  Stuff like how much force they must handle before failing.  

Otherwise, it is all about comfort and usually the more you part for a car the more thought went into the seat design as the rest of the car; hence a better seat.

Answer 3

that makes no sense... reword