Dynamic loading refers to the crane effect when the load starts and stops.

• A. It refers to the start/stop of load
• B. It refers to static weight
• C. It refers to wind
• D. It refers to temperature

Answer: (A)

Dynamic loading is about the extra forces that occur as the load begins moving and then comes to a stop. When you start lifting, the load resists changes in motion due to inertia, so the tension in the hoist rope and the stresses in the crane rise above the static weight. Likewise, when you stop, the moving mass must be brought to rest, creating another peak in forces. These transient effects mean the crane must withstand higher loads than the load’s static weight alone. The other factors, like static weight, wind, or temperature, influence loads in different ways, but they don’t define dynamic loading in this context. In practice, operators use smooth starts and stops and refer to dynamic load factors in charts to ensure safe operation.