How does acceleration of the hoist affect the load's effective weight?

• A. Acceleration reduces the load weight
• B. Acceleration has no effect on load weight
• C. Acceleration only affects the speed, not weight
• D. Acceleration increases the dynamic load due to inertia, reducing the capacity available for the static load

Answer: (D)

When you accelerate the hoist, you create an inertial force on the load. For a vertical lift, the rope tension grows to T = m(g + a) during upward acceleration, so the load is effectively heavier than its static weight. That extra dynamic force uses part of the crane’s rated capacity, leaving less room for the static load. So increasing acceleration raises the dynamic load due to inertia, reducing the capacity available for the actual static load. This is why the correct description is that acceleration increases the dynamic load due to inertia, reducing the capacity available for the static load.