What does friction not depend on?

1. Weight of the body
2. Nature of surface
3. Area of surface in contact
4. Temperature

Area of surface in contact

Reason —

For any two given surfaces, friction is independent of the shape or area of the surfaces in contact.

Friction depends on the following factors :

• 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.
• Temperature : Friction depends upon whether the medium is solid, liquid or gas. 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.