Lubrication

• Lubrication reduces frictional forces
• Whenever something moves, there's usually at least one frictional force acting against it.
• An object moving causes some energy in the system to be dissipated. E.g. air resistance can transfer energy from a falling object's kinetic energy store to its thermal energy store
• For objects that are being rubbed together, lubricants can be used to reduce the friction between the object's surfaces when they move
• Lubricants are usually liquids (like oil), so that they can flow easily between objects and coat them
• Streamlining reduces air resistance as well as lubrication