Final answer:
Hard hats are essential protective gear that resist impact and absorb shock to prevent head injuries at construction sites and other hazardous workplaces.
Step-by-step explanation:
Hard hats are designed and constructed to resist impact and absorb shock. The primary purpose of wearing a hard hat is to protect the head against injuries from falling objects, collisions, and other hazards that one might encounter on a construction site or in other hazardous work environments. This personal protective equipment is essential for preventing head injuries and is a critical aspect of workplace safety.