So your head didn’t hit the stone of the road, I guess that helps.
But, you still hit your head on *something,* essentially. The inside of your helmet.
All that force is still in there, right?
In: Physics
It’s damped by the cushioning material of the helmet. Think of getting punched in the gut with a memory foam pillow blocking it vs nothing.
They spread the impact force out over a larger area. The hard shell of the helmet hits the ground in one point and then the foam inside helps to distribute that impact across half of your skull. It’s still bad to crash, but helmets help prevent you from cracking your skull open, breaking your jaw, or winding up with massive gashes in your flesh.
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