Evaluate the use of expanded polystyrene as a material in the manufacture of cycling helmets, as shown. - Leaving Cert Engineering - Question 2(a) - 2016

Expanded polystyrene is a lightweight material, which is crucial for cycling helmets as it ensures that they do not add unnecessary weight to the rider's head. This characteristic enhances comfort and usability during cycling.

Additionally, polystyrene is easily moulded, allowing manufacturers to create intricate designs and shapes that are both visually appealing and aerodynamic. This means that not only can the helmets look attractive, but they can also effectively reduce air resistance.

A significant advantage of using expanded polystyrene is its ability to absorb impact forces. In the event of an accident, the material can compress, thereby dissipating energy and reducing the impact forces transmitted to the rider's head. This property is essential for ensuring safety and protecting against head injuries.

Furthermore, polystyrene retains a warm touch, making it comfortable to wear against the skin. However, it is also important to note that while polystyrene is effective, it does have limitations in terms of heat resistance and durability over long periods, especially if exposed to direct sunlight regularly.