what r factors affecting friction???

Friction actually depends on the roughness or smoothness of the surfaces of the object. Even some smooth objects that we usually see everyday (ex. glass, mirrorr,etc.) aren't that smooth when magnified by strong microscopes. They still have rough surfaces therefore they can also have friction.

Factors that affect friction:
1.) Adhesion
2.) Surface roughness
3.)The area of an object which is in contact with the surface. The larger the surface in contact, the greater friction.
4.)The texture of the surface and/or the object. The rougher/more uneven the surface/object, the greater the friction.
5.) The weight on the surface. The larger the weight, the greater the friction
6.)The angle of the surface. The greater the angle of the surface, the greater the friction.