Why does rolling friction happen?

Explore the intricacies of rolling friction in this enlightening video, which delves into the dynamics of a perfect sphere descending a flawless incline—a classic physics paradox.In an ideal scenario, the normal force's line of action intersects the sphere's center, resulting in zero torque, and the absence of sliding at the contact point means frictional force performs no work.However, real-world conditions introduce surface deformations, expanding the contact area and shifting force concentrations to the sphere's front.This shift leads to the normal force exerting a torque that opposes rotation.Additionally, minor sliding due to these deformations causes mechanical energy loss.Collectively, these factors contribute to what is known as rolling friction.