1. Ball Bearings: These small, round metal spheres allow objects to roll instead of slide, significantly reducing friction. They're used in everything from bicycles to roller skates to large industrial machinery.
2. Lubricants: Oils, greases, and other lubricants create a thin layer between surfaces, separating them and reducing friction. This is essential in engines, gears, and many other moving parts.
3. Air Bearings: These use a thin layer of compressed air to create a cushion between two surfaces, effectively eliminating contact friction. They are used in high-precision machinery, like hard drives and semiconductor manufacturing equipment.
