Bicycle and motorcycle helmets have to be replaced every couple of years and after any accident or drop in order to be safe. Why then are football helmets, which encounter more frequent impacts, safe to be used over and over again? Is there a reason vehicle helmets couldn’t be designed like football helmets?
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They’re designed differently to function differently. Riding fast requires more force protection at the expense of breathability and function of the neck shoulders. Football helmets need to let the player breathe and have more motion for example.
1/2 mass x velocity squared = force.
Once you’re moving fast, your size and mass play a less significant factor to force. Higher speeds will cause more force exponentially faster than mass ever can.
Also football helmets don’t make it safe, they make it more safe.
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