Question

define the force of friction list the factor affecting the force effect of friction explain with

Answer 1

Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth. ... Thefactors which affect frictionare: The weight of the objective. That is the normal reaction which the surface applies on the object.

Answer 2

Friction is the force that opposes that motion and tendency of motion between two surfaces which are in contact with each other.
Affects of friction are :-
1)It acts on the surfaces which are in contact.
2)It can stop the moving object.Like if you stop pedalling the pedals of bicycle.