METHODS OF REDUCING FRICTION
There are a number of methods to reduce friction in which some are discussed here.
USE OF LUBRICANTS:
The parts of machines which are moving over one another must be properly lubricated by using oils and lubricants of suitable viscosity.
USE OF GREASE:
Proper greasing between the sliding parts of machine reduces the friction.
USE OF BALL BEARING:
In machines where possible, sliding friction can be replaced by rolling friction by using ball bearings.
DESIGN MODIFICATION:
Friction can be reduced by changing the design of fast moving objects. The front of vehicles and airplanes made oblong to minimize friction.