Pulleys are ubiquitous in everyday life, industry, and technology. Ten common examples include: first, window blinds and shades that use small cords to lift heavy fabric; second, flagpoles that raise and lower flags via a top wheel; third, construction cranes used to lift heavy steel beams; fourth, elevators that balance passenger cars using overhead drive sheaves and counterweights; fifth, gym weight-lifting machines that route cables through grooved wheels; sixth, clotheslines used to slide wet laundry across yards; seventh, automotive serpentine belt idler and alternator pulleys; eighth, sailing ship block and tackle rigging; ninth, bicycle gear derailleur tensioner pulleys; and tenth, garage door spring cable pulleys.
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