The correct answer is dynamic load. Dynamic loads are characterized by their changing nature and can be caused by factors such as wind, traffic, or any other type of moving force. Unlike static loads, which remain constant and do not change over time, dynamic loads fluctuate and can significantly affect the structural integrity of a roofing system.
Wind load is a prime example of a dynamic load; it varies in intensity and direction based on environmental conditions. This variability means that structures must be designed to withstand these changing forces without compromising safety or stability.
Recognizing the distinction between dynamic and static loads is crucial for proper roofing design and construction, as it informs the materials used and the engineering required to ensure long-term performance under various conditions.