08-08-2017, 09:55 PM
(08-08-2017, 08:45 PM)Au165 Wrote: Because a helmet can't stop the brain from slamming into the inside of the skull when you decelerate from 20MPH to a dead stop in fractions of a second.
This. You don't even need to be hit in the head to sustain this type of injury. Think whiplash injury for example. Seat belt prevents your head from hitting the dash, but you sustain a concussion from your brain smacking against the inside of your skull. The "whip" aspect of the whiplash is a force multiplier because it dramatically increases the acceleration of the head.
