Rolling friction is a type of force that opposes the motion of a rolling body on a surface. It is the force that resists the motion of a rolling object on a surface and is also known as rolling resistance. When an object rolls over a surface, it experiences resistance to its motion, which is a type of kinetic friction and known as rolling friction. The point at which the object is in contact with the surface is critical in understanding rolling friction. At this point, both the object and the surface deform due to factors like elasticity, weight, and roughness. The cause of rolling friction is this deformation.

Some key features of rolling friction are:

• Rolling friction is considerably weaker than sliding friction.
• Coefficients of rolling friction are generally 100 to 1,000 times less than coefficients of sliding friction for corresponding materials.
• There are three laws of rolling friction: (1) with the increase in smoothness, the force of rolling friction decreases, (2) rolling friction is expressed as a product of load and constant to the fractional power, and (3) rolling friction force is directly proportional to load and inversely proportional to the radius of curvature.

Examples of rolling friction can be observed in daily life, such as when a soccer ball is kicked, it stops after rolling on the ground, or when a car comes to a stop after rolling downhill and reaching a flat road.

In summary, rolling friction is a force that opposes the motion of a rolling body on a surface, and it is considerably weaker than sliding friction. It is caused by the deformation of both the object and the surface at the point of contact.