What function will cause the load to exert leverage on the crane?

What function will cause the load to exert leverage on the crane?

• A. To Lift
• B. To Swing
• C. To Lower
• D. To Travel

Answer: (B)

Swinging the load creates a lever action because the weight’s line of action moves away from the crane’s centerline, forming a moment arm. When the load swings like a pendulum, horizontal forces develop on the hook, trolley, and supporting structure, increasing bending moments and the potential for tipping or undue stress. Lifting or lowering keeps the load aligned with the vertical, adding mainly vertical load and minimal lever effect. Traveling changes the crane’s position but doesn’t introduce the same lever arm from the load about the crane’s support. So the swing of the load is the action that causes leverage on the crane.

Swinging the load creates a lever action because the weight’s line of action moves away from the crane’s centerline, forming a moment arm. When the load swings like a pendulum, horizontal forces develop on the hook, trolley, and supporting structure, increasing bending moments and the potential for tipping or undue stress. Lifting or lowering keeps the load aligned with the vertical, adding mainly vertical load and minimal lever effect. Traveling changes the crane’s position but doesn’t introduce the same lever arm from the load about the crane’s support. So the swing of the load is the action that causes leverage on the crane.