Question

Why is fiberglass preferred over metal for making high jump bars?

• A. Metal is too flexible for accurate performance
• B. Fibreglass is light, flexible, and safer on impact
• C. Metal bonds permanently; fibreglass is rigid
• D. Fibreglass is cheaper and easier to shape

Answer 1

Answer:

B. Fibreglass is light, flexible, and safer on impact

Material Properties of High Jump Bars

• Lightweight Composition: Fiberglass is significantly lighter than traditional metal bars, reducing the risk of injury if the bar falls on the athlete during a landing.
• Flexibility and Durability: Unlike rigid metal, fiberglass exhibits elasticity, allowing it to flex upon contact without undergoing permanent deformation or snapping under pressure.
• Safety Standards: The material is designed to shatter safely or bend upon impact, which minimizes potential lacerations or blunt force trauma compared to heavy, solid metal bars.
• Aero-elasticity: Fiberglass bars maintain their shape better under wind conditions and vibration, providing a more predictable experience for athletes during competition.
• Standardization: According to World Athletics (formerly IAAF) regulations, high jump bars must be made of fiberglass or other suitable materials that are round, lightweight, and capable of resting on the supports without excessive sagging.