![](/nationalgeographic/pathfinder_april_2019/simple_machines-pulley_power/251309/pulleys.800_0_1.png)
Don’tletaheavyloadmakeyoufrown.It’seasytoliftbypulling down.
ByGlen Phelan
SimpleMachines
Explorermagazine’ssix‑part series
SimpleMachines
Explorermagazine’ssix‑part series
This edition
HumanJourney
PhysicalScience
Asyouread,thinkaboutallthepulleysyouseeanduseevery day.