Head injury criterion

Head injury criterion is a way for people who make cars and helmets to figure out if they are safe to use. They use a special number called HIC (Head Injury Criterion) to help them figure it out.

Imagine that you are playing with your toys and you accidentally bump your head on the table. It hurts, doesn't it? Well, when people get in car crashes or play sports without helmets, they can also bump their heads and get hurt. So, the people who make cars and helmets want to make sure that they don't hurt you too much.

So, they use a special machine that helps them see how much your head would move and shake if you got into an accident or hit by something. They measure how hard your head hits something and how long it takes for your head to stop moving. Then they use this information to calculate the HIC.

If the HIC is too high, it means that your head would shake and move too much if you get in an accident or hit by something. This can cause serious brain injuries, and the people who make cars and helmets don't want that to happen. So, they work to make sure that the HIC is low enough that you won't get hurt too badly if you bump your head.

In summary, the Head Injury Criterion (HIC) is a way for people who make cars and helmets to figure out if they are safe to use by measuring how hard your head hits something and how long it takes for your head to stop moving. If the HIC is too high, it means that your head would shake and move too much, which can cause serious brain injuries.