What are the factors that affect friction?

Factors affecting friction :

• Nature of surfaces in contact : As, friction arises due to irregularities on the surfaces of the objects so more the irregularities, greater will be the friction. Since a smooth surface has lesser irregularities as compared to a rough surface, friction is less for smooth surface and more for rough surface.
• Weight of the body : Frictional force depends directly on the weight of a body so if the body is heavier then its frictional force is greater. In other words, more force will be required to move a heavier body than a lighter one.
• The nature of medium in which the body moves : A solid, liquid or gas, all exert the force of friction on a moving body. The force of friction between a solid and another solid is more, it is less between a solid and a liquid and still less between a solid and a gas.