Simple Machines Toolkit
Mechanical advantage — ideal versus actual — across the six classics: levers of all three classes, inclined plane, wedge, screw, pulley systems, and gear trains. Covers §13.0.
Lever
Inclined Plane · Wedge · Screw
Pulley System
Gear Train
Tooth counts driver → driven, one pair per line for a compound train, e.g. 12 36 then 15 45.
Every simple machine sells the same trade: less force for more distance (or the reverse), never less work. IMA counts the geometry of that trade; AMA counts what friction leaves you; their ratio is the efficiency.