Question

what is causes of friction?

Answer 1

The main cause of friction is motion. Friction oppose relative motion.

Answer 2

Hey Friend

▶Friction is a force that resists the relative motion between two objects or materials.

✨Causes

⭐Molecular adhesion (Molecular Force)

⭐Surface roughness

⭐Deformation

✔Molecular Adhesion

When two objects are brought into contact, many atoms or molecules from one object are in such close proximity to those in the other object that electromagnetic forces attract the molecules of the two different materials together.

✔Surface Roughness

All solid materials have some degree of surface roughness. At one time or was thought that the surface roughness of materials was the cause for friction. In reality, it only has a small effect on friction for most materials.

✔Deformation

Soft materials will deform when under pressure. This also increase the resistance to motion. When materials deform, you must "plow" through to move, thus creating a resistive force. When the deformation becomes large, such that one object sinks into the other, streamlining can affect the friction, similar to what happens in fluid friction.

Hope it helps ☺☺☺

BEST OF LUCK ✌