Mechanics & Machines
Wheels & Axles
Two cylinders locked together. Trade rotation distance for force — or strength for speed.
Dragging a heavy box? Brutal. Same box on WHEELS? Easy. Wheels might be the world's biggest invention. Why are they SO good?
Concepts you just met
Wheel & AxleMechanical AdvantageRolling vs Sliding FrictionDoorknobs & Steering