Category
Levers & Pulleys
How Levers Work: The Three Classes Explained
A lever is a rigid bar and a pivot — nothing more — yet it's the oldest force-multiplying machine we have. Here's the moment-balance math behind it, and how the three classes of lever differ.
Block and Tackle: How Pulleys Multiply Your Pulling Force
A single pulley just changes the direction you pull. Add a second, movable pulley and you start multiplying force — here's how counting rope segments tells you exactly how much.