Which ladder component transfers the climber's weight to the beams?

Which ladder component transfers the climber's weight to the beams?

• A. Rail
• B. Rung
• C. Tread
• D. Sheave

Answer: (B)

The main idea is how the climber’s weight moves through a ladder. When you stand on a rung, your downward force is taken by that rung, which is the crosspiece joining the two side rails. The rung is designed to pass that load into the rails, and from there the rails transfer the weight down to the ladder’s supports or beams. So the rung is the part that directly carries your weight and channels it into the rails, making it the component that transfers the load to the beams. The other parts don’t serve this direct weight-transfer role: a rail is the side member that supports the load overall, a tread is typically another term for a rung but not the component that first bears your weight, and a sheave is a pulley wheel not used in standard ladders.