2007-03-22 17:19:06 · 3 answers · asked by frontstreetboy2004 3 in Science & Mathematics ➔ Physics
Newtons 3rd law.It states that for every action there is an equal but oppsite force to that action
Therefore, when there is a sudden stop/brake/crash, there will be a backward movement of the human's head relative to the car's motion. This exerts a force on the seat's headrest which in turn exerts a force on the head(3rd law).However, with the headrest, it acts as a safety feature and slows down the time in which the head comes to rest(decelaration) thus it prevents severe neck injury during such circumstances.
2007-03-22 17:27:51 · answer #1 · answered by llcold 2 · 0⤊ 1⤋
I THINK it because Newton's law states that anything in motion will not stop until "something" stops it. A headrest in a car may prove to stop the back of your head meeting the back of your shoulders.
2007-03-22 17:25:20 · answer #2 · answered by Cindy J 4 · 1⤊ 0⤋
an object in motion stays in motion.
an object at rest stays at rest.
:D
2007-03-22 17:26:39 · answer #3 · answered by hilarywatchler 2 · 0⤊ 0⤋