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Class 1 Levers
Second-Class Levers - Simple Machines
Basic Biomechanics: Levers
Three Lever Classes by Ron Kurtus - Succeed in Understanding Machines
Pivot diagram of a Class 1 lever — Science Learning Hub
File:Lever (PSF).png - Wikimedia Commons
Levers: How to distinguish the classes of lever
lever - Students | Britannica Kids | Homework Help