Why do suspension bridges use steel cables instead of solid steel beams?

Answer: They resist pulling forces without being too heavy

They resist pulling forces without being too heavy ✓ — Correct! Suspension bridges use steel cables because they have exceptional tensile strength—resistance to being pulled apart. Bridge cables support the deck's weight through tension. Steel cables can handle enormous pulling forces while being much lighter than solid steel beams. Cables in suspension bridges can support tens of thousands of tons while remaining flexible during wind and movement.

They cost less than solid steel beams — Wrong. While cables can be more efficient than beams for certain designs, they're used primarily for their tensile strength. Suspension bridges need materials that resist pulling forces—steel cables excel at this while being lighter than solid beams capable of the same load.

They are easier to paint and maintain — Wrong. Maintenance isn't why cables are used. Steel cables are chosen because of their exceptional tensile strength—they can support enormous weight through tension while being lighter than equivalent solid beams. Paint and maintenance are considerations, not reasons for the design choice.