![](/nationalgeographic/pioneer_april_2019/simple_machines-pulley_power/252185/pulleys.800_0_1.png)
Don’tletaheavyloadmakeyoufrown.It’seasytoliftbypulling down.
ByGlen Phelan
Simple Machines
Explorermagazine’ssix‑part series
SimpleMachines
Explorermagazine’ssix‑part series
This edition
HumanJourney
PhysicalScience
Asyouread,thinkabouthowpulleyscanbesolutionsto problems.