Which load is a light material but can stop lifting in windy conditions?

Which load is a light material but can stop lifting in windy conditions?

• A. Concrete block
• B. Steel plate
• C. Plywood
• D. Water tank

Answer: (C)

Wind can dramatically affect how a load behaves, especially when the load is light but has a large surface area. A thin sheet of plywood is easy to catch in a breeze; its light weight means the wind doesn’t need to be strong to push it around. As gusts push the sheet, it acts like a sail, causing the load to jerk, swing, or drift. That sudden movement can make the crane hard to control and may trigger safety limits, so the operator might stop lifting to keep everything safe and regain control. The other options are much heavier and less prone to being moved abruptly by wind, even if they catch some gusts. Concrete blocks and steel plates have substantial mass that resists wind forces, while a water tank is usually bulky and heavy when filled, so it doesn’t respond to wind in the same easily-d misguiding way as a light plywood sheet.

Wind can dramatically affect how a load behaves, especially when the load is light but has a large surface area. A thin sheet of plywood is easy to catch in a breeze; its light weight means the wind doesn’t need to be strong to push it around. As gusts push the sheet, it acts like a sail, causing the load to jerk, swing, or drift. That sudden movement can make the crane hard to control and may trigger safety limits, so the operator might stop lifting to keep everything safe and regain control.

The other options are much heavier and less prone to being moved abruptly by wind, even if they catch some gusts. Concrete blocks and steel plates have substantial mass that resists wind forces, while a water tank is usually bulky and heavy when filled, so it doesn’t respond to wind in the same easily-d misguiding way as a light plywood sheet.