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Headrests don't work. Headrests don't move. If they don't move, they don't perform work. That is a law of physics. Work is defined as "Force through a distance".
...but....
You probably are asking how they function relative to the laws of motion. The headrest prevents your head from continuing in its current state of motion when the car is struck from behind. Without the headrest, your head snaps backward relative to the seat and strains the neck. That sort of injury is called "whiplash".
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Why was Albert Eistein famous?
He was famous for his great laws,equations on physic and mathematics.
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Each state has there own laws regarding children in car seats, you would need to check with your located DMV.
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The guidelines for baby seats for California should be posted in the state laws. In the state laws it will tell you how long a child should be in a car seat based on age, height and weight.
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Found it on your DOT site. Click the link below
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