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The Doorstop as a Wedge: Why a Small Taper Holds a DoorA Bottle Opener and the Leverage Behind Its HandleBicycle Gear Ratios: How Teeth, Rotation and Direction RelateThe Pulley at a Window Blind: Guiding a Cord Around a WheelWhy a Screw Holds: Threads, Contact, and Turning Force
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Pulleys

Understand how wheels and ropes guide a load and its supporting force.

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The Doorstop as a Wedge: Why a Small Taper Holds a DoorMechanismsA Bottle Opener and the Leverage Behind Its HandleLeversBicycle Gear Ratios: How Teeth, Rotation and Direction RelateGearsThe Pulley at a Window Blind: Guiding a Cord Around a WheelPulleysWhy a Screw Holds: Threads, Contact, and Turning ForceFasteners