Holditinplaceormoveitalong.Screwsdobothjobsallday long.

something screwy going on

ByGlen Phelan

Screw

Simple
Machines

Explorer magazine’ssix‑part series

Beforeyou read

SimpleMachines

Explorermagazine’ssix‑part series

lever
inclined plane
Wedge
screw

This edition

wheel and axle
pulley

HumanJourney

PhysicalScience

Engineersimproveexistingtechnologies.Afteryouhavecompletedtheactivity,thinkofwaystoimprove it.