How does safety helmet protect
our head when we fall from height or objects fall on our head?
Safety helmet is intended to protect our head from injuries, caused by falling objects, fall from height or hitting our head against any hard surface. We must know how helmet works to protect our head from above mentioned causes.
Helmet works on simple principles of physics. When an object falls on our head or our head hits on a hard surface, a large force is applied on our head in a very short time. In physics, this phenomena is known as Impulse.
Safety helmet is intended to protect our head from injuries, caused by falling objects, fall from height or hitting our head against any hard surface. We must know how helmet works to protect our head from above mentioned causes.
Helmet works on simple principles of physics. When an object falls on our head or our head hits on a hard surface, a large force is applied on our head in a very short time. In physics, this phenomena is known as Impulse.
Hence
Impulse = Force x Time
Force
= Impulse / Time
Pressure
= Force / Area
As area increases, effect of
pressure reduces. Lastly the chin strap and nape strap plays a crucial role to
keep the helmet in position, while we fall from height or during fall of object
from height on our head.
As you know , from the above
formula, if time increases force will reduce and impact of the hit or fall will
be reduced. The anti-concussion tapes (helmet refill) inside the helmet increases
the time over which the impulse acts.
Hence the impact of the hit/fall on our head will be reduced. At the same time the outer rigid shell of the helmet, spreads the force to a larger area instead of allowing the object to hit at a point on our head. Hence the pressure exerted by force is reduced.
Hence the impact of the hit/fall on our head will be reduced. At the same time the outer rigid shell of the helmet, spreads the force to a larger area instead of allowing the object to hit at a point on our head. Hence the pressure exerted by force is reduced.
Pressure = Force / Area
As area increases, effect of pressure reduces. Lastly the chin strap and nape strap plays a crucial role to keep the helmet in position, while we fall from height or during fall of object from height on our head.
Hence,All the people whose are working at construction sites are advised to wear safety helmet.
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9 comments:
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