What material commonly used in helmets helps to absorb impact?

Foam is the material commonly used in helmets that helps absorb impact. It is specifically designed to mitigate the forces experienced during collisions or falls. The structure of foam allows it to compress upon impact, which slows down the deceleration of the head and reduces the risk of injury. This energy absorption property is critical in protecting the skull and brain from the potentially devastating effects of sudden stops or impacts.

While materials like plastic and carbon fiber can be part of the helmet's shell, they primarily provide structural integrity and do not possess the same energy-absorbing characteristics as foam does. Metal, on the other hand, is too rigid to effectively absorb impacts, making it unsuitable for use in helmets designed for safety. Foam's unique properties make it indispensable in helmet design for activities involving potential head injuries, including ATV riding.