Some Questions on Physics (Force) HELMETS

[Shane-O]

1. Why is the force reduced for a helmet with a soft interior VS Hard interior?

2. What points would need to be considered during design and construction to ensure that the impact on the body is decreased? What criteria must be met?

3. Why should a helmet be replaced every 5 years regardless of wear and collision?

4. Once A helmet has been involved in a collision why should it be replaced?

 

[Drakkith]

1. Why is the force reduced for a helmet with a soft interior VS Hard interior?

Hard interiors transfer the energy of the collision very quickly and efficiently. If you apply a force, such as the force of your head impacting the concrete, over a short amount of time or distance then the acceleration (or deceleration) is higher than if you increase the time or distance the force is transfered. One of the main causes of injuries is very high acceleration of the body. This causes internal organs to impact the inside of the body with a large amount of force, injuring them. Also, soft interiors absorb energy better than hard ones, leaving less energy available to cause injury.

Note that just because one helmet feels softer inside doesn't mean it is actually better. A soft foam that absorbs almost no energy will be much worse than a firmer one that absorbs alot. Make sure any helmet you get is certified.

4. Once A helmet has been involved in a collision why should it be replaced?

Absolutely. Especially helmets like motorcycle helmets. They are designed so that on impact the helmet absorbs the energy, resulting in permanent damage to the helmet instead of your head. Even a small amount of damage to the helmet could be what causes permanent brain injury. Just because the helmet looks like it only has a few scratches doesn't mean the inside hasn't been damaged.

 

[gsal]

3. Why should a helmet be replaced every 5 years regardless of wear and collision?

Probably because the materials used degrade over time and their properties will not be the same...instead of remaining spongie, they dry and become brittle or something.

 

[Shane-O]

Thanks guys i really needed that

 

[pmacias]

1. The force is reduced for a helmet with a soft interior compared to a hard interior because the soft material is able to absorb and distribute the force from an impact. This helps to decrease the overall force applied to the head and brain, reducing the risk of injury. In contrast, a hard interior does not have the same ability to absorb force, leading to a higher force being applied to the head.

2. When designing and constructing a helmet, several points must be considered to ensure that the impact on the body is decreased. First, the helmet must be made of materials that are able to absorb and distribute force, such as foam or gel. The helmet should also have a proper fit to ensure that it stays in place during an impact. Additionally, the helmet should cover the head and crucial areas of the face, such as the forehead and temples. The criteria that must be met include following safety standards and regulations, conducting impact tests, and using high-quality materials.

3. A helmet should be replaced every 5 years regardless of wear and collision because the materials in the helmet can degrade over time, reducing its ability to absorb and distribute force. Additionally, helmets are constantly being updated with new technologies and safety standards, so it is important to have the most up-to-date helmet for optimal protection.

4. Once a helmet has been involved in a collision, it should be replaced because the impact can cause damage to the material and structure of the helmet, reducing its effectiveness in future impacts. Even if there is no visible damage to the helmet, the force of the impact could have weakened the materials, making it less able to protect the head in the future. It is important to replace the helmet to ensure maximum protection in case of another impact.