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Answers
First what is friction?
=> Friction is the resistance to the movement of a body over the surface of another body..
FRICTIONAL FORCE: The force which opposes the relative motion of two surfaces of bodies in contact, is called frictional force. It is calssified into 4 types..
● SLIDING FRICTION: It is the friction which comes into play when the surface of one object moves relative to the surface of another object....
● STATIC FRICTION: It is the friction which comes into play when surface of the objects are at rest telative to each other...
● ROLLING FRICTION: When one bodyvrolls over the surfavr of another, the friction offered is called rolling friction....
● FLUID FRICTION: When bodies move through fluids, fluids exert a frictional force called fluid friction or drag...
Frictions can be reduced by,
1) Using lubricants
2) ball bearings
3) oil or grease